Creating a lean-to on to an existing Gambrel shed

by John Szesnat Sr.
( Altamont, NY)

I am wishing help with building a Lean-to off my existing shed the existing shed (Photo Attached) is 10'x10' and 10'7" high. Need help in designing and with the roof pitch. I would like the lean-to to be as wide 8 to 10 feet and high as possible This a first for building as was the shed. Please, any help would be appreciated.

Thank you for your time and effort in this matter.

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Apr 15, 2009
Creating Your Lean To Shed
by: John - Admin

Hi John,
Thanks for your question. In my opinion the governing factor of the height of your lean-to shed will be the eaves level of your current shed. The new roof will slope away from the shed. I would suggest a minimum roof slope of about 20 degrees. This will probably limit the width of the lean to as at some point you will have a problem with headroom.

To maximize headroom for the shed on your photo (thanks for providing this it really helps!) build on the downhill side of the shed. Other tips to maximize the headroom available would be to have a dirt floor or cast a concrete base. Using a base like this will give you a height advantage as the existing shed looks like it is built on skids.

The critical junction to pay attention to will be the junction between the existing shed and the new roof. Lead, zinc or copper flashing or PVC alternative should be used here to water proof this junction and stop any splashes or wind driven rain getting the cladding any wetter than normal.

Let me know how this sounds so far and then we can move on to the roof structure and supports.

All the best


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