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i have added a 4-12 pitch to garage,that ws flat before. using trus-joists pro 150’s, now i need some help with framing the valley to exsisting house,also framed with 150’s,problem.garage is 10 inches higher than house.and cannot find info on this anywhere.already contacted trus-joist.no reply yet.. thank you , Chris
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As I recall, I-Joists are not designed for roofs. You need to follow the manufacturer's instructions.
*b WBA At Your ServiceGeorge, you are misinformed. I-Joists are often used for rafters, they just take more work to make the birdsmouth cuts than dimensional lumber because of the added blocking that is necessary.Christopher, you need to ask a more specific question or questions. Typically add-on valleys are done by laying a board (2x6 min, up to a 2x12) flat onto the existing roof for your plate or bearing surface. The rafters have level cuts with a bevel that are nailed into this plate. The plate's location can be found by straight-edging across the tops of your new rafters to find the intersecting points on the sheathing of the old roof.
*I'm taking a guess here, but I'd bet it involves web-stiffeners each side, and a clip or two from the valley ledger to the stiffeners.Just a guessNathan
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i have added a 4-12 pitch to garage,that ws flat before. using trus-joists pro 150's, now i need some help with framing the valley to exsisting house,also framed with 150's,problem.garage is 10 inches higher than house.and cannot find info on this anywhere.already contacted trus-joist.no reply yet.. thank you , Chris