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Question DetailsAsked on 9/28/2015

i am attaching a lean to shed to the side of my garage. my garage wall is warped so how do I square it up?

My shed is only 6x6x2

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1 Answer


Three easy ways - do NOT try to true up the garage wall itself - too much work and too many consequences for just a shed job.

1) run the back piece of the shed framing (ledger board or rim joist) straight, shimming behind it to hold true before fastening to the house

2) run the contacting ledger board or rim joist flush to the house (so curved) then either cut the rafters coming off that to proper length beforehand to adjust, or like the pros just put them in and then stringline the ends to a straight and paralle to house cutoff line and trim the ends of the rafters on that line

3) don't fasten it to the house at all except for sway bracing - build with a back frame that supports it independently.

Whichever you do, be sure to properly flash the intersection of the shed with the house so you don't get rainwater and snowmelt down into the interface and rotting the siding. Look to web info on water shield and flashing at intersecting rooflines (where a roof comes up against a wall coming down from a higher story or the side of a dormer or such) for how to handle this. Another way for a small shed like this is to put a ledger trim strip along the house caulked to the house, with ice and water shield and flashing under it and over the edge of the shed roof and tied into the shed roof on top of the shingles in the shed roof - typically a 1x4 wood strip (caulked under the top edge before applying PLUS bevel-caulked along the top to shed water), with 4x2 or 4x3 flashing with the 2 or 3" side vertical under the ledger strip to catch any water coming down the wall and divert it onto the top of the roof. Should have ice and water shield under it on the wall and under the ledger strip, coming down under the shed roof water barrier as a secondary water barrier to prevent rot at that point. In heavy snow/icing country go with a wider ledger strip and longer legs on the flashing, or coil flashing.

Answered 5 years ago by LCD

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