Porch ledger and exterior insulation
In the next few weeks I’ll be installing 2” of exterior insulation along with a rain-screen made out of 2x4s. I have a shed porch roof that will come off one of the sides and I’m still a little unsure of my planned method in terms of how I’m attaching the porch roof to my house. The goal is to minimize thermal bridging, but still have a solid connection. Here’s the details:
– The porch is designed to be freestanding, so the attachment to the house is mostly to give some additional shear strength and to properly flash the metal roof to the siding. All vertical loads will be supported by independent posts and footings.
– There is no rim board or band joist where my porch roof intersects my house (why I decided to go freestanding). Between my studs, I’m putting 2×12 blocking. To give the blocking a more secure connection than just nails or screws, I’m using Simpson LS90 angle plates on each side of the blocking.
– I’m using Brick Brackets (42” O.C.), which will be secured through the sheathing and into the blocking using structural screws. The porch ledger will then be attached to the Brick Brackets with a through bolt that will also go through the 2×12 blocking. These Brick Brackets are typically used for deck ledgers, I’ve attached a picture to what this will look like.
This might be a little hard to conceptualize, so I’ve included a few drawings of my porch design.
Anyone notice anything that could be an issue?
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