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Jason83
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# Posted: 29 Apr 2019 08:03pm
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Hello,
I'm planning on building a 18'X36' ICF cabin with a shed roof. My plan is to use glulam beams to span the 18' width + 5' overhang in the front and 1' over overhang in the back. SIP roof panels would then be placed atop of the beams.
My question is on the best method for setting the glulam beams on the ICF. My thought is to cut beam pockets into both walls and cut birds mouths into the glulam beam to provide a full bearing. I like this method as the ICF wall would extend directly to the SIP roofing panel, however I believe the beams would have to be oversized to account for the notch on the higher bearing.
I recently watched a video on youtube of a similar build however the builder angled the top plates to match the angle of the rafters. Is this a better method, what is the proper connection to prevent the shear force of the roof sliding back?
Are there any better methods for completing this?
Any help or comments are definitely appreciated.
Thanks.
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Princelake
Member
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# Posted: 30 Apr 2019 06:58am
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I've never built with icf and just thinking out loud my thought is there has to be some type of bracket out there for that application. Or you the same bolts as a regular foundation for a home use sill gaskets and a 2x10 or 12 like you would starting a house floor and add your hurricane tie brackets to that.
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NorthRick
Member
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# Posted: 30 Apr 2019 03:56pm
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The glulam beam manufacturer will most likely frown on the birdsmouth cut into their beam. All those boards that make up the beam are not the same. In a standard beam, high quality boards are on the bottom, medium on the top, and lower quality boards in the middle. A birdsmouth will cut through the most important board in the beam.
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ICC
Member
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# Posted: 30 Apr 2019 06:38pm
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An ICF is an engineered product and so is a glulam beam. If you are going to use engineered products you need input from the manufacturer of the product if you intend to modify. Warranties will be voided on modified products. As well you could easily find yourself with a weakened structure.
NorthRick is absolutely correct.
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ICC
Member
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# Posted: 30 Apr 2019 06:41pm
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Quoting: Jason83 youtube of a similar build however the builder angled the top plates to match the angle of the rafters.
NO, rafters are meant to be placed on a horizontal wall top plate. Of course on Youtube, anyone can upload a video of anything and they don't have to be correct.
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