The Complete Guide to Windows, Doors and Weatherproofing

How to read the tags

Every statement carries a marker. Markers link to the source list at the end of this page.

• [S#] Source in the list below. Primary: code text, agency page or maker instruction. [S#] in a different color: secondary (summary, other jurisdiction, third-party host).
• [P] Crew practice, no source. Treat as our habit, not a rule.
• [V] Verify before use.
• [B] Statement in the customer research brief.

The chip at the start of each point sums up its confidence: Sourced, Secondary source, Crew practice, Verify or Customer brief. The approved plans, the adopted California codes, the unit maker's instructions and your inspector overrule this page. Not engineering or legal advice. Content as of 2026-11-02.

1. Day 1 safety

Day 1

• Sourced Wear safety glasses for all cutting, nailing and sealant work; eye protection must meet ANSI/ISEA Z87.1 criteria [S10].
• Sourced Extension ladders: set the base about one-quarter of the working length out, rails 3 ft above the landing, rungs 10 to 14 in apart; tag and pull defective ladders [S9].
• Sourced Cal/OSHA Title 8 Section 1670: personal fall arrest, restraint or positioning systems are required where a fall could exceed 7 1/2 ft from a structure perimeter or unprotected edge, or on roofs steeper than 7:12 [S22]. Roofing work follows Section 1730 instead. Ask your lead which system the job uses [V].
• Crew practice Sealants and foams need gloves and ventilation; read the SDS and pick respirator cartridges from it [P].
• Crew practice Cut-resistant gloves for metal flashing and glass; two-person lifts for large units and use a suction lifter for glass [P].
• Verify Houses built before 1978 may have lead paint; check the federal and California lead-safe renovation rules before removing old trim or sash [V].
• Sourced Cutting masonry or concrete for an opening creates silica dust. Title 8 Section 1532.3 sets a limit of 50 µg/m3 (8-hour average) and an action level of 25 µg/m3, and its Table 1 lists tasks (masonry saws, handheld drills, jackhammers) with required controls [S23]. Which controls fit your cut comes from your lead and the Table 1 row [V].
• Sourced Old paint can hold lead. Title 8 Section 1532.1 sets a lead action level of 2 µg/m3 and a limit of 10 µg/m3 (8-hour averages) and treats manual demolition, manual scraping and heat guns as presumed over the limit until the exposure is assessed [S24]. Pre-1978 paint rules from EPA are not covered here [V].
• Verify Old sealant or putty can contain asbestos; test before cutting. Abatement needs a licensed C-22 contractor or a subcontract [S4][V].
• Sourced Cal/OSHA worker rules are in Title 8, not in the building code [S1].

Play it: Ladder setup (math) · Safety glasses with side shields (tool) · Extension ladder (tool) · Half-face respirator with organic vapor cartridges (tool) · Cut-resistant work gloves (tool) · Window suction lifter (tool)

2. How water gets in and how we stop it

Day 1

• Crew practice Water moves by gravity, wind pressure and capillary action; the job is to give it a drained path to the outside [P].
• Secondary source Think shingles: every upper layer laps over the lower layer so water runs outward [S8].
• Secondary source The sill is the most vulnerable spot; a sloped pan with a back dam is the safety net [S8][S12].
• Secondary source Sealant is not a substitute for flashing [S8].
• Secondary source Never seal the bottom flange; it must be able to drain [S8].
• Crew practice A window is not waterproof by itself; the install makes it weather-tight [P].
• Crew practice Leaks usually show up where layers meet: corners, laps, penetrations [P].

Play it: Sill pan, flexible or rigid (tool) · Weather-resistive barrier (house wrap) (tool)

3. Windows and doors: types and parts

Day 1

• Secondary source Flanged (nail-fin) windows have a perimeter fin fastened to the sheathing; retrofit (block-frame) windows fit inside an existing frame [S8][P].
• Crew practice Operating types include casement (hinged), double-hung, slider and fixed; each gives different clear opening area [P].
• Crew practice Parts: frame, sash, glazing, sill, jambs, head, flange, hardware [P].
• Verify The NFRC label shows rated performance; leave it on until final inspection [P][V].
• Crew practice Prehung exterior doors come in a frame with hinges and a threshold [P].
• Secondary source Door sills need a drained pan like a window sill [S12].
• Sourced Read the maker installation instructions first; they override crew habit [S11].

Play it: Flanged (nail-fin) window (tool) · Retrofit (block-frame) window (tool) · NFRC label and glazing stamps (tool) · Prehung exterior door (tool)

4. Measuring and layout

Day 1

• Crew practice Measure width at top, middle and bottom, height at left, middle and right, and use the smallest [P].
• Crew practice Measure both diagonals; equal diagonals mean a square opening [P].
• Verify Tolerance 1/8 in on diagonals is crew practice, maker controls [P][V].
• Crew practice Read the tape to 1/16 in and convert fractions for orders [P].
• Crew practice Check level and plumb with a level; flip the level to test it [P].
• Crew practice Keep a notebook of every opening with measurements and photos [P].

Play it: Tape fraction to decimal (math) · Diagonal square check (math) · Tape measure (tool) · Level, 4 ft (tool) · Framing square (tool)

5. Rough openings and framing checks

Year 1

• Verify Rough opening = frame size plus clearance; 1/2 in per side is a common starting point but the maker spec governs [P][V].
• Crew practice Check header, sill and jack studs are solid and level before the unit arrives [P].
• Secondary source Plane or shim the sill so it is flat; a flat sill is needed for the pan [S8][P].
• Crew practice Check for rot, insects, and moisture; use a moisture meter [P].
• Secondary source Egress openings must meet the size rule: net clear at least 5.7 sq ft (5.0 at grade floor), 24 in high, 20 in wide, sill at most 44 in [S2].
• Crew practice Do not cut structural studs or headers without the engineer or plan; ask [P].
• Verify A new or enlarged opening usually needs a permit and structural review [V].

Play it: Rough opening size (math) · Egress opening check (math) · Diagonal square check (math) · Moisture meter (tool) · Level, 4 ft (tool)

6. Weather-resistive barrier

Year 1

• Crew practice The WRB is the second line of defense behind siding or stucco [P].
• Secondary source Lap upper layers over lower layers, tape seams, and avoid wrinkles [S8].
• Sourced Cut an "I" or modified "I" at the opening and fold the flaps; cut corners at about 45 degrees [S11][P].
• Secondary source Fold the head flap up and out of the way until head flashing is on [S8][P].
• Secondary source Integrate the WRB with the pan, jamb and head flashing in the right order [S8].
• Secondary source Use only tapes and sealants the WRB maker approves [S8][P].

Play it: Weather-resistive barrier (house wrap) (tool) · WRB seam tape (tool) · Utility knife (tool)

7. Sill pans and back dams

Year 1

• Secondary source A sill pan is a tray that catches water at the sill and drains it outward [S12].
• Secondary source Flexible or rigid pans both need a back dam at the inside edge [S12].
• Secondary source Pan flashing runs at least 6 in up the rough jamb and at least 2 in onto the wall face [S8].
• Secondary source Formable pan flashing is commonly 6 in wide for 2x4 walls and 9 in for 2x6 walls [S8].
• Sourced Slope the pan outward; one maker says pans deeper or shallower than 6 in must slope to drain [S11].
• Verify The exact slope per ft is NOT in the sources read; use the maker spec [V].
• Secondary source Fasten pans only at side dams and flanges, not through the drain area [S12].

Play it: Sill pan slope (math) · Pan flashing width (math) · Sill pan, flexible or rigid (tool) · Self-adhering flashing tape (tool)

8. Flashing sequence: sill, jambs, head

Year 1

• Secondary source Order: sill pan, then set the unit, then jamb flashing, then head flashing [S8].
• Secondary source Jamb flashing extends beyond the lower and outer edge of the pan and above the head flange, and its top stays at least 1 in below the top of the head flashing [S8].
• Secondary source Head flashing laps over the jamb flashing and extends at least 1 in beyond it [S8].
• Sourced Use self-adhering flashing tape; clean, dry and roll it [S11][P].
• Crew practice Roll seams and corners; no fishmouths [P].
• Secondary source Metal head flashing or a drip cap sheds water over the head where the detail calls for it [S8][P].
• Crew practice Photograph every layer before it is covered [P].

Play it: Flashing lap check (math) · Flashing tape take-off (math) · Pan flashing width (math) · Self-adhering flashing tape (tool) · Flashing tape roller (tool) · Metal head flashing / drip cap (tool) · Liquid-applied flashing (tool)

9. Setting, shimming and fastening a unit

Year 1

• Secondary source Dry-fit the unit, then set on the pan and keep the drain path clear [S8].
• Secondary source Shim at hinge, lock and sill load points, plumb and level, fasten through shims [S12][P].
• Crew practice Do not over-shim; pressure bows the frame [P].
• Secondary source Fasten the fin per the maker; foam sheathing up to 1.5 in is common under fins, thicker may need clips [S8].
• Crew practice Open and close the sash after fastening to check it is not binding [P].
• Verify Do not fasten through the bottom fin where the maker says not to [V].

Play it: Shims, plastic, composite or cedar (tool) · Frame screws and jamb clips (tool) · Cordless drill/driver (tool) · Level, 4 ft (tool)

10. Sealants, backer rod and foam

Year 1

• Secondary source Seal top and sides; leave the bottom unsealed so water drains [S8].
• Sourced One maker calls for two 3/8 in beads at the head [S11].
• Secondary source Pick sealants compatible with the flashing; many silicones bond poorly to asphalt barriers and damp wood [S12].
• Secondary source Low-expansion foam: fill about 30 percent of the gap, apply 40 to 120 F, tack-free about 10 min, cure 1 to 6 hours (data sheet on a third-party host, verify) [S14].
• Secondary source Mask before foaming; cured foam is hard to remove [S14].
• Verify Use backer rod to set sealant depth; rod size per the sealant maker [V].
• Crew practice Tool the bead before it skins [P].

Play it: Sealant cartridge yield (math) · Sealant (polyurethane, silicone or hybrid) (tool) · Backer rod (tool) · Low-expansion foam (window and door) (tool) · Low-expansion foam gun (tool) · Caulk gun (tool) · Surface protection film and masking tape (tool)

11. Exterior doors and thresholds

Year 1

• Secondary source Door sills need a pan with a back dam and slope outward, like windows [S12].
• Crew practice Check the opening level, plumb and square; shim at hinges and strike [P].
• Verify Use long screws through hinges into framing; 3 in is common (verify) [P][V].
• Crew practice Weatherstrip and sweep seal the edges and bottom [P].
• Secondary source Door glazing counts as a hazardous location for safety glazing [S17].
• Crew practice Test-fit with the pan before final fastening [P].

Play it: Prehung exterior door (tool) · Long hinge screws (tool) · Door threshold and sill pan (tool) · Door weatherstrip and sweep (tool)

12. Egress and safety glazing

Journeyman

• Secondary source Every sleeping room, basement and habitable attic needs an escape opening [S2].
• Secondary source Size: 5.7 sq ft net clear (5.0 at grade floor), 24 in high, 20 in wide, sill at most 44 in [S2].
• Secondary source Below-grade egress needs a window well [S2].
• Secondary source Replacement exemption: largest standard size that fits and clear opening not smaller than old [S2].
• Secondary source 2025 CRC hazardous locations (R324.4 per [S17]): door glazing; glass within 24 in of a door edge and under 60 in; panes over 9 sq ft with bottom under 18 in, top over 36 in and walking surface within 36 in; tub/shower glass under 60 in; stair glass under 36 in; guards.
• Verify Stairway glazing distance: the CRC excerpt shows 36 in, but the CBC (2406.4.6) is shown as 60 in. Verify against the adopted text before relying on either [V].
• Verify Confirm section numbers in the adopted 2025 code; sources here are secondary [V].
• Secondary source Measure clear opening with the sash open [S2][P].

Play it: Egress opening check (math) · Safety-glazing area check (math) · Egress casement window (tool)

13. Energy code and NFRC labels

Journeyman

• Sourced Title 24 Part 6 sets window performance; it is part of the 2025 code in effect Jan 1, 2026 [S1].
• Verify Compliance uses the NFRC-rated U-factor and SHGC [V].
• Secondary source A Roseville (Climate Zone 11) form lists 0.27 U and 0.23 SHGC; this is another jurisdiction and zone, not Santa Barbara [S20].
• Verify Santa Barbara values: not found; use the CF1R and the NFRC label for each unit [V].
• Secondary source The form requires an installation certificate at final [S20].
• Verify Keep paperwork and labels for inspection [V].

Play it: NFRC label and glazing stamps (tool)

14. Wildfire hardening for windows and doors

Journeyman

• Secondary source 2025 California WUI Code 504.8: glazing must be multilayer with at least one tempered pane, glass block, 20-minute fire-rated glazing, or meet SFM 12-7A-2 [S18].
• Secondary source Windows within doors and glazed doors follow the same rule (504.9) [S18].
• Secondary source Operable skylights need a noncombustible mesh screen with openings not exceeding 1/8 in [S18].
• Verify The County points to CRC R337.8 and its High Fire notes for windows and doors; text not read [S19][V].
• Sourced Montecito Fire Ordinance 2025-02 adopts the 2025 WUI Code; it does not address windows and doors directly [S7].
• Verify Whether Ch.7A or the WUI Code controls on a given Montecito parcel is not confirmed [V].

Play it: Safety-glazing area check (math)

15. Montecito and Santa Barbara local rules

Master

• Sourced Montecito is unincorporated County of Santa Barbara; the City of Santa Barbara is separate [B][S5].
• Sourced City: window replacement needs a building permit even like-for-like [S5].
• Sourced City: design review may apply to upper windows 17+ ft above ground, hillside lots over 20 percent slope and historic resources [S5].
• Sourced City: buildings over 50 years old need Architectural Historian review [S5].
• Sourced City: no openings within 3 ft of a property line; limited to 25 percent of wall between 3 and 5 ft [S5].
• Verify County: window permit rules not found; call Planning and Development. The County says all building permits require inspections and lists its code at Chapter 10, Building Regulations [S27] [V].
• Sourced Montecito Fire Protection District: 595 San Ysidro Rd, (805) 969-7762 [S6].
• Sourced Montecito Fire adopted the 2025 California Fire Code and WUI Code on Nov 17, 2025 [S7].
• Sourced County Board of Architectural Review: projects in the Montecito Community Plan area, the Design Control Overlay or the Critical Viewshed Corridor Overlay must go to BAR. The packet lists exemptions (fences 6 ft or less, solar panels, pools and spas, decks, interior alterations) and does not mention window or door replacement; the Montecito BAR meets every other Thursday [S25].
• Secondary source County Code Chapter 40 limits loud amplified sound in unincorporated areas from 10 p.m. to 7 a.m. Sunday to Thursday nights and midnight to 7 a.m. Friday and Saturday nights; the text does not mention construction [S26]. No County construction work-hours rule was found [V].
• Verify Coastal zone, hillside, grading and debris-flow rules for windows: not found [V].

16. Testing and quality assurance

Journeyman

• Crew practice Photograph each layer before covering [P].
• Secondary source Field water test: spray rack, 5 gal/h per sq ft [S16]; field pressure two-thirds of lab rating [S13].
• Secondary source Procedure A 15 min; Procedure B 4 cycles of 5 on, 1 off [S16].
• Secondary source Field air limit 0.15 cfm/sq ft (fixed or casement) and 0.45 (hung or slider) at 6.24 psf [S13][S16].
• Secondary source Blower door results are reported at 50 Pa as cfm50 or ACH50 [S15].
• Crew practice Use an infrared camera with a temperature difference to find leaks [P].
• Secondary source Ask the window maker for the written field-test rules before testing [S13].

Play it: Field water test numbers (math) · Air leakage limit check (math) · Water spray rack (field water test) (tool) · Air infiltration test chamber (tool) · Blower door fan kit (tool) · Infrared thermal camera (tool) · Digital manometer (tool)

17. Failures and leak diagnosis

Journeyman

• Secondary source Top failure: layers in the wrong order [S8].
• Secondary source Flat or inward sill pans; no back dam [S8][S12].
• Secondary source Sealant on the bottom flange [S8].
• Secondary source Wrong tape widths or products [S8].
• Crew practice Out-of-square openings [P].
• Secondary source Undersized egress [S2].
• Secondary source Thick foam with short fasteners [S8].
• Crew practice Diagnose by water test, moisture meter, and infrared, working from the top down [P].

Play it: Moisture meter (tool) · Infrared thermal camera (tool)

18. Master topics: estimating, permits, liability, specs

Master

• Verify A CSLB B contractor can self-perform framing and carpentry and take multi-trade projects; specialty scopes like glazing (C-17) and sheet metal (C-43) were not read, so check before self-performing [S4][S3][V].
• Crew practice Estimate: count openings, tape, sealant, flashing, labor; use calculators [P].
• Verify Read manufacturer warranties; installers can void them [P][V].
• Sourced Know the permit path: County for Montecito, City for Santa Barbara [B][S5].
• Verify Edition: 2025 California codes apply to permits from Jan 1, 2026; County adoption may differ [S1][V].
• Crew practice Document everything; photos, labels, CF1R, inspection records [P].
• Crew practice Mentor the crew with the lesson plan drills [P].

Play it: Flashing tape take-off (math) · Sealant cartridge yield (math)

Local rules at a glance

Montecito is unincorporated County of Santa Barbara [B]. City of Santa Barbara rules do NOT apply to Montecito. County adoption dates for the 2025 codes may differ from the state date of Jan 1, 2026 [S1]; confirm with the County.

Contacts seen

• City Planning Counter (805) 564-5578, PlanningCounter@SantaBarbaraCA.gov [S5]
• City Building and Safety Counter (805) 564-5485, CDBuildingCode@SantaBarbaraCA.gov [S5]
• City Hall, 735 Anacapa St, Santa Barbara 93101, (805) 963-0611 [S5]
• Montecito Fire Protection District, 595 San Ysidro Rd, Santa Barbara 93108, (805) 969-7762 [S6]
• County Planning and Development phone: not found. County pages: countyofsb.org/1082 (permitting), countyofsb.org/522 (Building and Safety) [S19][S21]. Call-first list is a task for the supervisor.

Flags and open items

These are the places where the research found a conflict or could not confirm a claim. Close them before you rely on the number.

• Verify Sill-pan slope per foot: crew practice only. No source read gives a number; the window maker controls. [P][V]
• Contested Window energy values: Roseville and Elk Grove 2025 forms show U 0.27 and SHGC 0.23; San Bernardino County quotes U 0.30; no Santa Barbara County form was found, so confirm with the County. [S20][S29][X1]
• Common sizes Pan flashing and tape widths (4, 6, 9 in) are common sizes, not code rules. [S8][S11]
• Verify Santa Barbara County window permit rules and the building code edition and adoption date; BAR treatment of windows, coastal, hillside and construction-hours rules: not found.
• Verify Primary text of the California Residential Code egress, safety-glazing and R337.8 sections: not read. Title 8 fall (1670), silica (1532.3) and lead (1532.1) were read in round 2. Section numbers (R324.4 versus older R308; R310) are not confirmed.
• Verify Whether a B contractor may install windows, doors and flashing without a C-17 or C-43 license: not read. [S3][S4]
• Verify Whether Chapter 7A or the WUI Code controls on a given Montecito parcel.
• Verify The 1:4 ladder base ratio comes from a summary of OSHA 1926.1053, not from the primary text read. Tool prices were not found; all say verify.

Sources

Accessed 2026-11-02. 29 usable, 2 excluded (wrong county), 2 not read (leads only). Round 2 added S22 to S29.

• S1 CA Building Standards Commission, 2025 codes primary
  https://www.dgs.ca.gov/bsc/codes
• S2 Permit Sonoma CNI-020 Egress windows (Sonoma County, not SB) secondary
  https://permitsonoma.org/instructionsandforms/cni-020emergencyescapeandrescuewindows
• S3 CSLB license classifications (titles only) primary
  https://www.cslb.ca.gov/About_Us/Library/Licensing_Classifications/
• S4 CSLB Fast Facts, General Building B primary
  https://www.cslb.ca.gov/Resources/Contractors/FastFacts-GeneralB.pdf
• S5 City of Santa Barbara, Window Replacement (modified 2026-04-14) primary
  https://santabarbaraca.gov/node/4631
• S6 Montecito Fire Protection District, Fire Code page primary
  https://montecitofire1.specialdistrict.org/fire-code
• S7 Montecito Fire Ordinance 2025-02 (Nov 17, 2025) primary
  https://www.montecitofire.com/files/09aa398df/Ord+2025+11.17.2025+-+Final.pdf
• S8 TN05 Window and Door Flashing technical note (copy hosted by Ocean City MD; publisher unconfirmed, footer suggests NAHB/Home Innovation) secondary
  https://oceancitymd.gov/oc/wp-content/uploads/TN05-Window-and-Door-Flashing_pdf-1.pdf
• S9 OSHA 29 CFR 1926.1053 ladders primary
  https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.1053
• S10 OSHA 29 CFR 1926.102 eye and face protection primary
  https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.102
• S11 Kolbe Windows installation instructions primary (one maker)
  https://www.kolbewindows.com/api/download/mapped/InstallationInstructions/319/
• S12 IIBEC, A Flash in the Pan (cites ASTM E2112-07) secondary
  https://iibec.org/publication-post/a-flash-in-the-pan-a-field-guide-for-windows-and-doors/
• S13 Graham Windows field testing white paper TD-014 secondary
  https://www.grahamwindows.com/wp-content/uploads/TD-014_Field-Testing-White-Paper.pdf
• S14 Window and door foam data sheet (DuPont, third-party host) secondary
  https://constructioninstruction.com/wp-content/uploads/2020/11/SPEC-57-DuPont-Window-Door-Foam-PHYSICAL-PROPERTIES-DATA-SHEET-AND-APPLICATION-INSTRUCTIONS.pdf
• S15 CX Associates, ASTM E779 summary secondary
  https://www.cx-associates.com/enclosure-testing/astm-e779
• S16 Intertek, AAMA 502-12 summary secondary
  https://w3prep.intertek-france.com/building/standards/aama-502-12
• S17 2025 California Residential Code excerpt, R324 hazardous-location glazing (gocodebook; paraphrased by fetch tool) secondary
  https://gocodebook.com/us/california/california-residential-code/building-planning/special-construction-and-hazards/fire-resistant-construction-and-safety-glazing
• S18 2025 California WUI Code 504.8 exterior glazing (gocodebook) secondary
  https://gocodebook.com/us/california/california-wildland-urban-interface-code/special-building-construction/openings-doors-windows-accessory-structures/window-and-glazing-requirements
• S19 Santa Barbara Fire Safe Council, Code and permits chapter (cites 2022 codes) secondary
  https://sbfiresafecouncil.org/wildfire-home-hardening-guide/chapters/code-permits.html
• S20 Roseville 2025 CF1R window replacement form (Climate Zone 11, not SB) secondary
  https://www.roseville.ca.gov/Documents/Development Services/Applications Forms and Handouts/Building/Forms/2025 CF1R Window Replacement_1_1_2026.pdf
• S21 County of Santa Barbara Building and Safety Division (role statement only; page body empty) primary
  https://www.countyofsb.org/522
• S22 CCR Title 8 Section 1670, personal fall arrest systems primary
  https://www.dir.ca.gov/title8/1670.html
• S23 CCR Title 8 Section 1532.3, respirable crystalline silica primary
  https://www.dir.ca.gov/title8/1532_3.html
• S24 CCR Title 8 Section 1532.1, lead primary
  https://www.dir.ca.gov/title8/1532_1.html
• S25 County of Santa Barbara BAR Information Packet (updated July 31, 2026) primary
  https://content.civicplus.com/api/assets/71a9f002-beca-48cd-9a24-d07524e0c52c
• S26 Santa Barbara County Code Chapter 40, Nighttime Noise Restrictions (gocodebook mirror) secondary
  https://gocodebook.com/library/us/ca/santa-barbara-county/chapter-40-nighttime-noise-restrictions
• S27 Santa Barbara County Code index (gocodebook mirror, updated 2026-10-08) secondary
  https://gocodebook.com/library/us/ca/santa-barbara-county
• S28 California Energy Commission, 2025 Energy Code overview primary
  https://www.energy.ca.gov/sites/default/files/2025-06/2025_Energy_Code_Overview_ADA.pdf
• S29 Elk Grove 2025 residential window or skylight alteration energy form (CZ12, not SB) secondary
  https://elkgrove.gov/sites/default/files/city-files/Departments/Building/residential/general/residential-window-or-skylight-alteration-energy-form.pdf
• X1 San Bernardino County window policy (wrong county, excluded) excluded
  https://lus.sbcounty.gov/wp-content/uploads/sites/48/Window-replacement-policy-2025-Final.pdf
• X2 San Bernardino County code adoption IB-0012 (wrong county, excluded) excluded
  https://lus.sbcounty.gov/wp-content/uploads/sites/48/IB-0012-2025-Code-Adoption.pdf
• X3 ICC IRC R310.2.1 (not retrieved) not read
  https://codes.iccsafe.org/s/IRC2021P3/chapter-3-building-planning/IRC2021P3-Pt03-Ch03-SecR310.2.1
• X4 SBC Fire Standard 6 Defensible Space (lead, not read) not read
  https://sbcfire.com/wp-content/uploads/2026/02/Standard-6-Defensible-Space_2_2026_Final.pdf