Fire Proofing ICF Exterior Wall
Last Post 24 Feb 2023 09:32 PM by dcadaret. 2 Replies.
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Rye Patch HollowUser is Offline
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12 Dec 2022 06:11 PM
Hi. New to the forum. I am in the process of organizing and beginning an ICF home build. I will be using an ICF installation contractor but they will be building to the dried in stage. I plan to use steel panels for the exterior but am concerned about fire risk due to the home being located in a heavily forested area. Is the steel panel enough protection or would something like Rock Wool 80 or 110 be a better choice to protect the ICF material underneath? Thanks!
sailawayrbUser is Offline
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13 Dec 2022 05:11 PM
Correct terminology is fire resistant. Nothing is fire proof. Steel exterior siding is rated fire resistant. We used Hardi concrete fiber panel exterior siding in a board and batten look which is also rated fire resistant.

We live in remote forested mountain area and experienced two wildfires with zero issues. We didn't evacuate when it was ordered (one can't be forced to evaluate one's home in Oregon) and we didn't even need to use our fire suppression water system. We don't have a fire department that responds to house fires in our area. We depend solely on the forestry department that only responds to forest fires. Since our buildings are considered highly fire resistant, we are able to get affordable home insurance whereas some of our neighbors can't get any home insurance at any price. There are photos of a wildfire at our place on our website if interested:

https://www.borstengineeringconstruction.com/Ramsey_Canyon_Wildfire.pdf

ICF is probably the best fire resistant wall structure you can have. Living in a forest is likely far better than living in a housing development as housing development fires burn far hotter and faster than wildland fires. Housing development fires also generate highly toxic smoke compared to only wood fire smoke. So I think you are well on your way to having a fire resistant and survivable home!

To have a fire resistant home, in addition to having a fire resistant wall structure (e.g., ICF), you need fire resistant doors, windows and roof. We used steel standing seam roof and tempered glass double pane windows. We used fine stainless steel screen to keep embers from entering the building via roof and soffit ventilation paths, etc. Our buildings are single level with full hip roofs having 4 foot roof eaves (a consequence and one of the design elements of their high energy efficiency passive solar design) which provides excellent overall building shielding from the intense wildfire burning ember storm. We have plenty of defensible space and we don't have any landscaping close to the buildings.

We have a fire suppression system with 8000 gallons of water stored in underground concrete tanks that can be pumped at 150 GPM into long fire hoses and fire nozzled long distance or misted as needed to fight a fire or create a fire resistant wet zone. While our buildings are well-sealed and don't allow smoke to enter when the windows are closed and HRV is turned off, we also have full face smoke respirator masks. One needs to be fully capable, prepared and self-reliant when living in remote areas.
Borst Engineering & Construction LLC - Competence, Integrity and Professionalism are integral to all that we do!
dcadaretUser is Offline
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24 Feb 2023 09:32 PM
Well, this is a late response. But, if you haven't checked out the FEMA guidance for fire-resistant buildings, it's a good place to start. They have free online training that goes through the planning, and options too. https://www.fema.gov/pdf/library/fema403_apa.pdf
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