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Tractor Talk Discussion Forum

O/T- lean-to shed roof flashing?

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dds-inc

06-10-2007 09:56:06




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I have just built a lean-to shed onto the side of my existing 24 x 28 shop. I just don't know how to flash the roof to the T-111 on the side of the existing shop. I am using shingles and the roof is close to a 3.5-12 pitch.

Any ideas are appreciated in advance.




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kyle in NY

06-10-2007 20:30:51




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 Re: O/T- lean-to shed roof flashing? in reply to dds-inc, 06-10-2007 09:56:06  
I'll side with the cutting of the T-111 and sliding the flashing up method. No ammount of adhesive or other material will give a better seal.



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suptscottyb

06-10-2007 15:02:27




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 Re: O/T- lean-to shed roof flashing? in reply to dds-inc, 06-10-2007 09:56:06  
Was gonna throw in my two cents - but these guys sure enough are tellin' you right! p.s. 25 year silicone is good to use where the flashing goes into the siding.



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Jim Johnson

06-10-2007 12:03:21




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 Re: O/T- lean-to shed roof flashing? in reply to dds-inc, 06-10-2007 09:56:06  
Well there is a only one good way and that is the right way.

Take a Skill saw and cut the T-111 using the 1 1/2 side flat aganist the siding (set the saw at exactly the depth of the siding) then using a sawzall cut the 1 1/2 off at the top of the lean to. Be sure and get the nails out of the T-111 first up high enough to tuck at least 6 inches of flashing up underneath the T-111 and let it hang down at least a foot on the lean to.

You can cut more than this off the T-111 to make it easier to get the flashing in just get a flat bar and pull the T-111 out as much as possible as far up as possible.

Remember the further up and the further out you go with the flashing the less likely it is going to leak. I know this sounds like a lot of work but do it right and you'll never have to do it again.

Jim

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Billy NY

06-10-2007 10:14:57




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 Re: O/T- lean-to shed roof flashing? in reply to dds-inc, 06-10-2007 09:56:06  
Photos would help, but probably not all that difficult to fasten something similar to reglet like is sometimes used on masonry walls that are pre-existing to an addition and have nothing built into the coursing of brick already. If you were to attach a piece of pre-formed metal, that would receive flashing, you just need to seal the vertical area behind it as it's attached to the T-111 siding, with a good sealant, and make a nice sealant joint on top of it. It would also be nice to have an overhang from the rood above on the main building. Someone else might have a better detail than this, but as long as you return up the vertical area that rises above the roof you joined to the wall with some kind of metal like a reglet or similar, then you have something to tie into from the new roof. The pieces you attach to the existing wall need to be continuous, if they overlap beacuse the dimensions are longer, make sure to seal that joint, and I'd overlap them at least 1'-0" same with the flashing. Under neath this you could also use a material like W.R. Grace Ice & Water Shield, seal the top of the vertical return at the T-111, then place metal flashing as described above. Again, someone else may have a cleaner detail than this, but I'd think something similar would perform nicely.

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John Harmon

06-10-2007 10:13:33




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 Re: O/T- lean-to shed roof flashing? in reply to dds-inc, 06-10-2007 09:56:06  
"In my opinion" do not use Roofing Cement at the sidewall roof joint and expect to have a water proof joint for very long.Ideally a Metal flashing should be installed over the Sheds Shingled Roofs last course and under the T-111 siding with the T-111 bottom cut off about 3" above where the Shed Roof and Bldg.Sidewall meet. Not possible? then have a Sheet Metal shop Bend some 12" wide Galvanized Flashing as long as possible at the Pitch of your Shed Roof. Bend at 6"on center, install a good Sealant to both Bldg. Sidewall and last course of Shed Roof Shingles. Install Flashing useing as few Nails as possible and wait for a Rain to see how effective the Flashing is. If some leakage occurs further sealing up of the flashing will have to be done.

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Walt Davies

06-10-2007 10:00:40




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 Re: O/T- lean-to shed roof flashing? in reply to dds-inc, 06-10-2007 09:56:06  
I would need to see a picture of what you have as there are many ways to do it all depending on what it looks like. A picture of where the shed roof is attached to the shop, top side showing shed roof and side wall of shop.
Walt



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