Lean to build

[Danny1888]

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!]

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!]

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.

 

[Farmer_Joe]

I would go steeper and std bay sizes like 15 ft? Then stuff will be easier to find such a shallow pitch gives higher loadings

 

[Fendt516profi]

I would go steeper and std bay sizes like 15 ft? Then stuff will be easier to find such a shallow pitch gives higher loadings

If it's a lean to the Bay size won't really be negotiable will it

 

[Farmer_Joe]

Ha ha maybe not thought 16ftvwas a wierd size it’s usually 20 or 15

 

[agri knives]

Ha ha maybe not thought 16ftvwas a wierd size it’s usually 20 or 15

Standard timber lengths here are 15ft 9”here.

 

[kill]

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

 

[Danny1888]

Workshop/ga

Is it a garage? 10ft high would be very limiting these days in all honesty and seriously not very stock friendly

It will be garage/workshop

 

[Danny1888]

Ha ha maybe not thought 16ftvwas a wierd size it’s usually 20 or 15

Sorry they will be 15ft bays. Typo sorry

 

[Danny1888]

This is a sketch of it

 

[Farmer_Joe]

Go mad and do a proper side extension

then you get decent height and proper pitch

 

[Ffermer Bach]

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.

 

[Fendt516profi]

Go mad and do a proper side extension

then you get decent height and proper pitch

Valley gutter then creates a whole different load of problems

 

[Farmer_Joe]

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

 

[Fendt516profi]

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

Depends on location but what about it getting filled with snow

 

[mixed breed]

I built exactly what your suggesting, 45long in 3 bays, 20 ft deep, 11ft low side 13ft high side. 8x4 uprights, and 7x4 rafters. 7x3 Purlins and full length box profile roof sheets. Been up 6 years now, had a good snow load to test it in 2018 and its still there.

 

[Skintagain]

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]

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.

 

[JP1]

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.

That's a nice shed. Wish I had the skills to make something like that