Lean to build

Danny1888

Member
Livestock Farmer
Hi all. I am thinking about putting up a lean to. 2 questions I have:

Lean will be 20ft deep. 12ft high side to 10ft low. Is 2ft over 20ft enough fall?

Hoping for 16ft span. Are 6x3 timbers ok? Will be 8x4 rsj being used.

Thanks in advance for any help
 

mo!

Member
Location
York
Hi all. I am thinking about putting up a lean to. 2 questions I have:

Lean will be 20ft deep. 12ft high side to 10ft low. Is 2ft over 20ft enough fall?

Hoping for 16ft span. Are 6x3 timbers ok? Will be 8x4 rsj being used.

Thanks in advance for any help
That's a 5° slope. My experience of flattish roofs is it that they leak.

You may get away with it if you are using box profile in full lengths.
 

mo!

Member
Location
York
That's a 5° slope. My experience of flattish roofs is it that they leak.

You may get away with it if you are using box profile in full lengths.
Eternit have a minimum fall of 5° but reccomend double sealing on the end laps and 300mm overlap on exposed sites.
 

kill

Member
Location
South West
Hi all. I am thinking about putting up a lean to. 2 questions I have:

Lean will be 20ft deep. 12ft high side to 10ft low. Is 2ft over 20ft enough fall?

Hoping for 16ft span. Are 6x3 timbers ok? Will be 8x4 rsj being used.

Thanks in advance for any help
Is it a garage? 10ft high would be very limiting these days in all honesty and seriously not very stock friendly
 
low pitch does not have to be a problem, especially if using European Profile, as one sheet can cover the whole span (except for the roof lights), this is a building we inherited when we moved here, and a simple construction like this is economical to put up.
 

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Farmer_Joe

Member
Livestock Farmer
Location
The North
Mine just takes the water away not really a problem I find it useful to keep the shed dry inside ;)

in all seriousness I would go side extension the pitch and heights your talking about are gonna make it compromised
 
I hate lean to’s. They aren’t as cheap as you think, you end up with a tunnel of a shed on many occasions, they are faffing about to bolt on, cutting holes in sheets etc. I prefer another shed spaced away gives a sheltered space in between and keep ventilation etc good.
 

Mur Huwcun

Member
Livestock Farmer
Location
North West Wales
Is it an actual lean to or a mono pitch building you’re planning? I made and built a mono pitch one here two years ago. 7m deep due to beams available as 14m. 8foot high at low point (to match up to a container) and nearly 13foot at highest point. Was 10degree pitch. 203*102*23 UB for rafters and columns due to easier to use same lengths and used 178*102*19 for gable posts and doorway. 7*3 perlins at full length of 4.8m as it was easier. Roof though are full length box section sheets that we had.
65733E10-5A55-4F12-9612-D3D78946288F.jpeg
0BB6E64B-E8E0-430F-8FB3-E189313B9D07.jpeg
 

JP1

Member
Livestock Farmer
Is it an actual lean to or a mono pitch building you’re planning? I made and built a mono pitch one here two years ago. 7m deep due to beams available as 14m. 8foot high at low point (to match up to a container) and nearly 13foot at highest point. Was 10degree pitch. 203*102*23 UB for rafters and columns due to easier to use same lengths and used 178*102*19 for gable posts and doorway. 7*3 perlins at full length of 4.8m as it was easier. Roof though are full length box section sheets that we had. View attachment 923559View attachment 923562
That's a nice shed. Wish I had the skills to make something like that
 

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