A Chicken Coop That Survives a Typhoon

The structural section of the broiler standard names two loads, and wind is not one

PAES 402:2001 is the Philippine Agricultural Engineering Standard for broiler housing, and its section 7 is titled Structural requirements. Read the whole section and the loads it names are two: section 7.1.2, roof structure “designed to carry additional dead loads such as suspended feeders”, and section 7.5.3, floor support “designed to carry concentrated loads such as the maximum total weight of the birds”.

That is all of it. Everything else in section 7 is dimensional. Corrugated GI sheets and at least a one-metre overhang (7.1.1), gutters (7.1.3), a ceiling at least 2.4 m (7.2), walls of “chicken wire or bamboo slats” (7.3.1), doors 900 mm by 2 m swinging inward (7.4.1), slats 25 to 50 mm wide (7.5.1.1), posts “at least 200 mm” in diameter and a floor raised “at least 900 mm from the ground” (7.5.1.4). Sukat lahat iyon. Walang isang linya tungkol sa hangin.

The single clause that acknowledges the hazard exists is section 7.3.2, and it is a sentence long.

Quoted

There should be provision to protect young chicks and older birds during periods of cold weather and extreme winds.

“Should”, not “shall”, which the standard’s own foreword defines as the difference between a recommendation and a requirement. No pressure, no fastener, no spacing, no wind speed. And this is not a document you may take or leave: DA Administrative Order No. 06, s. 2004 enforces the PAES “as integral parts in the design, construction, repair and maintenance of agricultural buildings and facilities”. Ang tanging enforceable na standard para sa kulungan ng broiler dito ay tahimik tungkol sa panahong bumabagyo.

What your province is actually designed against

The wind number exists. It is just in a different book, written for different buildings, and no backyard keeper owns a copy. The National Structural Code of the Philippines assigns one basic wind speed to each province, and the APEC-WW-2010 country report by Pacheco, Aquino, Tanchuling and Tanzo of the UP Diliman Institute of Civil Engineering reproduces the NSCP 2010 table in full.

Four things about that table before anybody builds on it. The speed is “a 3-second gust at 10 m elevation in open terrain”, which is a specific kind of measurement and not the wind you feel. The provinces are named as the 2010 table names them, so Compostela Valley and an undivided Maguindanao appear. The report notes Zone 3 was raised from 125 kph in the previous edition, so the number moves between editions. And I did not open the NSCP itself: this is its 2010 table as the country report reproduces it. The code is published by the Association of Structural Engineers of the Philippines and reviewed by DPWH to become a referral code of Presidential Decree No. 1096, the National Building Code, which is a chain no bakuran ever enters.

Kaya hindi ito pangako tungkol sa kulungan mo. Wala kang inhinyerong pumirma at wala kang permit. What the zone gives you is a yardstick: this is the wind a building near you is supposed to be designed against, and a coop of coco lumber and 0.4 mm yero is not that building. What each of those materials costs is a separate argument with its own dated receipts.

Ten stations, and four have already recorded more than their zone allows

PAGASA publishes a climatological extremes sheet per station, and one of its columns is the strongest wind ever recorded there, in metres a second. Hold that column against the basic wind speed the NSCP assigns the province, converted into the same unit, and the picture is not reassuring.

40% of the stations checked here have already logged a wind above the speed their province is designed against, and Daet misses by four tenths of a metre a second. Basco’s 86 m/s is 309.6 kph. Sa Batanes, ang record ay mas mabilis pa sa disenyo ng gusali doon, at hindi iyon ipinapakita ng anumang gabay sa pag-aalaga ng manok.

Three honest caveats and they matter more than the table does. PAGASA’s sheet labels that column only “STRONGEST WINDS (mps)” and states no averaging period, while the NSCP number is a three-second gust; those are not certainly the same kind of measurement and I could not find PAGASA saying which. The records cover different lengths of time, mostly 1966 to 2025 but 1950 to 2025 at Legazpi and Puerto Princesa. And a basic wind speed is a design value tied to a return period, so a single record above it is not by itself a failure of the code. It is a reason to stop treating the number as a ceiling.

Ang kulungan mo ay nasa listahan mula pa sa Signal 1

Twenty tropical cyclones enter the Philippine Area of Responsibility in an average year, and PAGASA puts it plainly: “With the average of 20 TCs in this region per year, with about 8 or 9 of them crossing the Philippines.” Peak season is July through October, when “nearly 70% of all typhoon develop”.

The wind signal system has been in use since 23 March 2022, and every level of it carries an impact paragraph. Read them for the phrase “structures made of light materials”, because that is your coop, and it appears at every signal including the first.

Two readings fall straight out of that ladder. The roof goes first and the wall goes later, in PAGASA’s own sequence: minor roof damage at Signal 2, partial wall damage at Signal 3, complete roof failure with possible wall collapse at Signal 4. Ang bubong ang unang aalis, hindi ang dingding. And the warning shrinks exactly as the danger grows, from 36 hours down to 12.

PAGASA also warns that the signal is a provincial figure and “local winds… may be substantially stronger” on high ground or near open water, and weaker where something shelters you. Ang bakuran sa gitna ng mga puno at pader ay hindi kapareho ng bukid sa gilid ng dagat.

Nobody publishes how to hold the roof down

This is the section I cannot fill, and saying so is the point. No Philippine document I opened on 22 August 2026 gives a fastener spacing, a purlin size, a gauge, or an uplift pressure for a backyard poultry structure. PAES 402 asks for corrugated GI sheets and at least a metre of overhang in section 7.1.1 and says nothing at all about how any of it is attached. The NSCP has provisions for components and cladding and they are written for buildings an engineer designs, in a volume I did not open.

So I will not invent a number, and you should distrust any coop guide that hands you one without a document behind it. Wala akong makitang Philippine figure, kaya wala akong isusulat na figure.

What is left is the mechanism, and PAGASA’s own damage ladder above is the evidence for it: roofs fail before walls do, at a signal below the one that takes the wall. The overhang the standard requires for shade and rain is also the largest surface a gust can work on, and PAES 402 requires it in one clause and never mentions wind in the next. That tension is real and unresolved in the standard itself. The ventilation article has the other half of it, because the same open long sides that make a coop survivable through a Philippine April are the sides a storm gets into, and section 8.6.1.3 of the same standard already expects the openings to be adjustable “as weather changes hourly and seasonally”. Ang tarpaulin na kayang ibaba ng isang tao sa loob ng isang minuto ang pinakamurang sagot doon.

Two DA documents, ninety degrees apart

Ask which way a coop should face and the Department of Agriculture has published both answers. PAES 402:2001 section 4.4 is a “shall”: “The building shall be constructed in an east-west orientation.” That puts the long open sides facing north and south, which is the orientation the coop pillar and the ventilation article both argue for, and it is right about heat.

Now read the DA’s own Regional Field Office 2 extension manual, which says the opposite and says why:

When the land dimension allows it, the poultry houses should be constructed with their length parallel to the wind direction. This setup will expose to the wind only the southern or the northernmost portion of the houses. If it were the other way around… all the pens with the birds therein would be exposed to draft and heavy rain during typhoons and bad weather.

The monsoons here run roughly north and south, so “length parallel to the wind” means a long axis running north to south. That is ninety degrees off PAES 402, from the same department, and neither document mentions the other. Walang nagreresolba ng dalawang ito sa kahit anong Philippine na dokumento na nabuksan ko.

My own reading, and it is a judgement rather than a citation: east-west wins. The heat case runs every afternoon of the year and the wind case is 8 or 9 landfalls, forecast 12 to 36 hours ahead, which is a management problem and not an orientation problem. The same manual offers the cheaper answer in its next line anyway, that discarded feed sacks “can be utilized as wind and sun breakers” and that “planting trees will also serve as windbreaks”. A windbreak you can add later. A building you cannot turn.

When you move the birds, and what the order actually says

DA Administrative Order No. 12, s. 2002, the Code of Practice and Minimum Standards for the Welfare of Chickens, has two clauses that bear on this and both stop short of a trigger. Section 10.2: “Site of poultry houses shall be properly chosen taking into consideration the risk of floods, typhoons and fires.” Section 10.5: “Sufficient exits shall be accessible to facilitate evacuation of chickens from buildings in cases of emergency.”

An exit requirement with no stated emergency. Iyon ang buong batas tungkol sa paglilikas ng manok. The trigger you actually have is PAGASA’s lead time, and it is the reason to decide early: at Signal 1 you have a day and a half, at Signal 4 you have half a day and the palengke is already closing.

Three things a bakuran can do inside 36 hours, none of them expensive. Move the birds somewhere with a wall and a roof that were built for people, which is what most keepers end up doing anyway. Drop and tie the curtains on the windward long side, and leave the leeward side open rather than sealing the building, which the standard’s own adjustable-openings clause already anticipates. Take down anything loose in the bakuran first, because PAGASA names “unsecured, exposed lightweight items” becoming projectiles from Signal 2 upward, and a flying feeder lid does the damage before the wind does.

One trap in moving them. AO 12 section 9.2.5 requires housing to “maintain temperatures between 19-33°C at all times”, and a crate of birds in a closed room in August will pass 33°C fast. Heat is the failure mode of the shelter, the way wind is the failure mode of the coop, and how many birds are in the box is the lever in both.

What the birds are worth is the reason to bother. PSA’s June 2026 farmgate broiler price was ₱150.31 per kilo liveweight, which puts a 1.7 kg bird at ₱255.53, and native chicken ran ₱223.95 per kilo in the same month (PSA OpenSTAT, read 15 August 2026). Day-old chicks were ₱33.50 a head on 13 July 2026 in BAI’s monitoring. A flock of twenty native manok is more money than most of what is in the house you would carry them into.

What nobody publishes

Five gaps, and they are why this page is arithmetic and quotation rather than a construction detail. It belongs with the rest of the register.

• No Philippine wind load for agricultural housing. PAES 402:2001 section 7 names two loads and neither is wind. Nothing newer replaces it that I could find.
• No fastener, purlin or uplift figure for a backyard structure, in any Philippine document I opened. The NSCP’s component and cladding provisions exist, are written for engineered buildings, and I read them nowhere: what this page quotes of the code is a 2010 table reproduced in a country report.
• PAGASA’s extremes column has no averaging period on the sheet. It is labelled only “STRONGEST WINDS (mps)”, which leaves the comparison with a three-second-gust code approximate by an amount nobody has quantified.
• No signal is named as an evacuation trigger for backyard poultry in any DA, BAI or PAGASA document I read. AO 12 requires the exits and stops there.
• PCIC’s own site would not open on 22 August 2026, returning a challenge page rather than the programme terms, so this article says nothing about what livestock insurance covers. Better a gap than a description from memory.

What usually goes wrong

1. The mistake: Treating a typhoon as a rare event the coop design can ignore.

   Do this instead: Design for the wind case as a scheduled annual event, the way you already design for April heat.

   PAGASA puts the long-run average at 20 tropical cyclones entering the PAR each year with 8 or 9 crossing the country, and nearly 70% of them developing between July and October.

2. The mistake: Waiting for Signal 3 before deciding whether to move the birds.

   Do this instead: Make the call at Signal 1 or 2, when you still have 24 to 36 hours.

   PAGASA attaches a shrinking lead time to a rising signal: 36 hours at Signal 1, 24 at Signal 2, 18 at Signal 3, 12 at Signals 4 and 5. The decision does not get easier, only later.

3. The mistake: Sealing the coop shut when the signal goes up.

   Do this instead: Close the windward side and leave the other one open, and adjust it as the wind backs round.

   PAES 402 § 8.6.1.3 already expects the openings to be adjustable as weather changes hourly, and AO 12 § 9.2.5 requires 19-33°C at all times, which a sealed box under a GI roof in August does not deliver.

4. The mistake: Copying a fastener spacing or a "typhoon-rated" figure off a coop guide.

   Do this instead: Check whether the figure names a document. If it does not, do not use it.

   No Philippine standard publishes one for a structure this size, so any number circulating for a bakuran coop was either imported from a cold-climate guide or made up.

5. The mistake: Turning the building north-south for the wind case.

   Do this instead: Keep the east-west long axis and buy a windbreak instead.

   PAES 402 § 4.4 makes east-west a "shall" and it pays on every hot afternoon of the year; the DA RFO 2 manual that argues the other way offers feed sacks and planted trees as windbreaks in its next paragraph, and a windbreak can be added to a building already standing.

The reason no American coop guide helps here is that its weather problem is the opposite one. A Vermont coop is designed against snow sitting on the roof, a load that pushes down and stays for months. Nothing pushes down here. The load comes sideways and lifts, it arrives eight or nine times a year with a name and a forecast, and the standard written for it in this country has a structural section that never mentions it. Kaya hindi disenyo ang sagot dito. Ang sagot ay ang desisyong ginagawa mo 36 oras bago dumating ang hangin, at kung ilan ang manok na kaya mong ilipat ay bahagi ng desisyong iyon.

Questions people actually ask

At what wind signal should I move my chickens out of the coop?

No Philippine document I could open on 22 August 2026 names a signal. DA Administrative Order No. 12, s. 2002 section 10.5 requires that poultry houses have "sufficient exits accessible to facilitate evacuation of chickens from buildings in cases of emergency" and never says what triggers one. What PAGASA does publish is the warning lead time attached to each signal, and that is the number to plan against, because it shrinks as the threat rises. Signal 1 comes with 36 hours, Signal 2 with 24, Signal 3 with 18, and Signals 4 and 5 with 12 hours each. A keeper who decides to move birds only when Signal 3 is hoisted has 18 hours to find crates, a room and help, in weather that is already deteriorating. The decision is cheaper at Signal 1 and it is the same decision.

What wind speed is a chicken coop in the Philippines built to withstand? Show the answer

None that anybody wrote down. PAES 402:2001, the Philippine Agricultural Engineering Standard for broiler housing that DA Administrative Order No. 06, s. 2004 makes an integral part of the design of agricultural buildings, has a section headed Structural requirements and specifies roofing material, a one-metre overhang, gutters, wall material, door sizes, slat widths, a post diameter of at least 200 mm and a floor raised at least 900 mm. The only loads it names are the dead load of suspended feeders in section 7.1.2 and the concentrated weight of the birds in section 7.5.3. The number that exists for buildings is in the National Structural Code of the Philippines, which assigns a basic wind speed to each province, and a backyard coop is not an engineered structure that any of it was written for.

Which way should a coop face if typhoons are the worry? Show the answer

Two Department of Agriculture publications give answers ninety degrees apart. PAES 402:2001 section 4.4 states that the building shall be constructed in an east-west orientation, which puts the long open sides facing north and south. The DA Regional Field Office 2 extension manual says the opposite for wind, that houses "should be constructed with their length parallel to the wind direction" so that only the northernmost or southern end is exposed, and warns that the other arrangement leaves all the pens exposed to draft and heavy rain during typhoons. Neither document mentions the other. East-west is the orientation that pays on every hot afternoon of the year, and the wind case is short, forecast 12 to 36 hours ahead and manageable by other means.

Does the basic wind speed for my province tell me anything useful? Show the answer

It tells you what a properly engineered building near you is designed against, which is the only yardstick published at all. The NSCP 2010 zoning puts fourteen provinces in Zone 1 at 250 kph, most of the country in Zone 2 at 200 kph and eighteen mainly Mindanao and Palawan provinces in Zone 3 at 150 kph, each a three-second gust at 10 m in open terrain. It is not a promise about your coop, which no engineer signed for, and it is not a maximum: at four of the ten PAGASA stations checked on this page the strongest wind already in the record is above the speed assigned to that province.