2026 Typhoon Structural Readiness Checklist

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Design & Build

🌀 Typhoon Season 2026 — Free Resource

Typhoon Structural Readiness Checklist

Pre-Typhoon Season Structural Inspection for Philippine Homeowners — Roof, Walls, Windows, Foundation & NSCP 2015 §207 Wind Load Compliance

📅 June 2026 — Typhoon Season Active

⚡ Peak Season: August–October

🏗️ By: J. Abuyabor, CE · PRC #0125154

Your Typhoon Readiness Progress

0 / 30 items checked

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Roof-to-Wall Connections (Most Critical — Most Common Failure)

NSCP §207 Uplift

Metal hurricane straps or anchor bolts connect every rafter/truss to the top wall plate Critical

This is the #1 typhoon fix. Uplift forces at 200 km/h can reach 3,000–8,000 N per linear meter of wall. Mortar alone provides ~500 N/m. If you have no straps, this is your first priority.

Roof ridge connection is braced — ridge board or ridge beam is supported at peak, not floating Critical

An unsupported ridge that relies only on rafter thrust can spread and collapse under asymmetric typhoon loads. Check for collar ties or a central support column at the ridge.

Roof framing members show no visible rot, rust-through, or cracked/broken sections

Inspect rafters and purlins from inside the attic if accessible. Rot at the base of wooden rafters where they bear on the wall is the most common hidden defect — this is where failure initiates.

Eave overhangs are braced — no long unsupported cantilever extensions beyond 600mm

Wide eaves create large uplift forces and act as wind scoops. Overhangs beyond 600mm need diagonal knee bracing from the rafter to the wall. Unbraced wide eaves are the most common source of flying debris in typhoons.

Roofing sheets (GI, color roof) are fastened with correct typhoon screws at correct spacing — not just nails

Roofing nails pull through corrugated sheets under uplift. Self-drilling screws with neoprene washers at 300mm or less along every purlin are the correct fastening for typhoon-exposed areas. Check that screws are not stripped or missing.

Gable End Walls (Triangular Walls at Ends of Pitched Roof)

NSCP §207 Lateral

Gable end walls have RC columns at each end and at maximum 3m intermediate spacing Critical

Gable end walls are the most exposed wall in a typhoon — they receive full lateral wind load from storms approaching along the house length. Without columns, an unreinforced CHB gable wall over 2.5m tall will fail under design wind pressures.

Gable end CHB walls have vertical rebar (at least 10mm dia at 400mm max spacing) and horizontal bond beams

Bond beams at 600mm vertical spacing and at the top of the wall tie the CHB panels into the column frame. Without these, individual block courses can separate and fall outward in high winds.

No existing diagonal cracks in gable end walls — especially from corners of openings

Diagonal step cracks in CHB gable walls indicate the wall has already experienced lateral movement or differential settlement. A cracked gable wall has significantly reduced typhoon resistance — this needs engineer assessment before the next storm.

Window & Door Frame Anchorage

NSCP §207 C&C

Window frames are anchored into the RC frame with embedded bolts — not mortar only Critical

A window frame blown in by typhoon wind immediately pressurizes the house interior. Internal air pressure then adds to roof uplift from below — accelerating roof failure. Anchor bolts at 300–400mm spacing into the concrete frame are the standard. Test: push hard on the frame — it should not flex or move at the wall junction.

Door frames anchored — all hinges and lock hardware secure, no gap between frame and wall

Double-check entry doors, garage doors, and any large sliding doors — these have the largest surface area and highest wind load per opening.

Window and door perimeter sealed with quality weather sealant — no gaps admitting wind or water

Gaps in sealant allow driven rain to penetrate at high velocity during typhoons, saturating walls and accelerating structural damage. Re-seal any cracked or missing sealant before typhoon season peaks.

Louvers, jalousies, or capiz windows have been assessed — these are the weakest opening type in typhoons High Risk

Jalousie/louvre windows cannot be sealed and provide almost no wind resistance. If your house has these on windward-facing walls, storm shutters or temporary boarding before each major typhoon is strongly recommended.

CHB Wall Reinforcement & Condition

NSCP §207 / §208

All exterior CHB walls have vertical rebar in cells and horizontal bond beams at max 600mm spacing

Properly reinforced CHB walls resist lateral wind pressure adequately. Unreinforced CHB walls of 3m height can fail at wind pressures corresponding to typhoon signal 2 conditions.

No long unreinforced wall spans over 3m without an intermediate column or pilaster

Wall spans over 3m between supports multiply the bending moment on the wall panel significantly. For typhoon-exposed walls, 2.5m maximum span between columns is the better practice.

No existing cracks in exterior walls — horizontal, vertical, or diagonal

Horizontal cracks indicate flexural failure under lateral load. Diagonal cracks indicate shear or foundation movement. Either type means reduced wall capacity for the next typhoon — have an engineer assess before the peak season.

Foundation, Drainage & Flood Risk

Typhoon Rain Exposure

No evidence of foundation scour or soil erosion around footings — especially for houses near waterways Critical if near water

Houses within 50m of a river, stream, or estero are at scour risk during heavy typhoon rainfall. Check: is there exposed footing concrete visible above grade? Has the soil level dropped around the house perimeter? These are warning signs.

Roof gutters are clear and draining freely — no blockage by leaves, debris, or bird nests

Blocked gutters during typhoon rainfall cause overflows that saturate wall tops, accelerate wall cracking, and can cause roof weight loading from pooled water in low-slope sections.

Ground drainage slopes away from the house foundation — no pooling against exterior walls

Water pooling against walls during typhoon rainfall saturates the soil, reduces bearing capacity, and accelerates corrosion of embedded rebar in footings and columns. Grade the ground surface to drain at least 100mm drop per 600mm from the wall.

For houses in flood-prone areas: first-floor electrical panels, switches, and plugs are at least 300mm above historical flood level

Electrical damage from flooding is often more costly than structural damage. During and after a typhoon with flooding, do not enter a house with standing water until power is confirmed off at the main breaker.

Canopies, Overhangs & External Structures

Flying Debris Risk

All canopy/awning structures have diagonal knee bracing — not just vertical posts High Risk if missing

Unbraced canopies and carports are the most common source of wind-borne debris in Philippine typhoons. A collapsing canopy can puncture adjacent walls or block exits. Knee bracing from post-top to roof framing dramatically increases lateral stability.

Perimeter fence posts are embedded at least 600mm deep — not just surface-mounted or loose

Fence panels that detach in typhoon winds become projectiles. Concrete hollow block fences without steel posts are especially vulnerable. Check for leaning panels and loose mortar at post bases before typhoon season peaks.

Satellite dishes, solar panels, water tanks, and rooftop equipment are securely bolted — not just placed

Any rooftop equipment not properly anchored becomes a projectile at typhoon wind speeds. Verify anchor bolts into concrete for every item on your roof. Check that solar panel frames have not loosened over time.

NSCP 2015 §207 Wind Load Compliance

Engineering Requirement

Your house was designed with explicit NSCP 2015 §207 wind load calculations by a licensed engineer Critical

Without this calculation, nobody knows whether your house meets the legal minimum wind resistance standard. It doesn't mean it will fail — but it means the risk is unknown. NSCP §207 requires calculation of velocity pressure, external pressure coefficients, and design loads for the roof and walls specific to your house and location.

The design wind speed used matches your province's NSCP 2015 Table 207-1 basic wind speed

Region	Basic Wind Speed
Metro Manila, most of Luzon	200 km/h
Northern Luzon (Cagayan, Isabela)	220 km/h
Eastern Visayas, Eastern Samar	250 km/h
Western Visayas, Palawan	200 km/h
Mindanao (most areas)	200 km/h

🇵🇭 Para sa mga Pilipinong Homeowner: Ang checklist na ito ay para suriin ang ISTRAKTURA ng iyong bahay bago dumating ang malakas na bagyo. Hindi lang pagkain at kandila — ang bubong, dingding, at pundasyon ang nagtatakda kung mananatiling buo ang iyong bahay pagkatapos ng bagyo. Kung may nakita kang problema sa checklist na ito, makipag-ugnayan sa Aedo Construction para sa LIBRENG assessment. Viber: +63 956 142 1819

Found Vulnerabilities in Your Checklist?

Aedo Construction's licensed engineers conduct typhoon structural assessments for Philippine homeowners — checking all 7 categories above with a documented report of what needs to be fixed, in what order, at what approximate cost. Free initial consultation.

Get Free Assessment 💬 Viber: +63 956 142 1819 ✉ Messenger Get a ₱299 Structural Risk Report