Lean to build

aled1590

Member
Location
N.wales
62FEF8F1-C76C-42B2-BC6F-111E3C331739.jpeg

this is ours, not planned. Left monopitch was built first and plan was to sheet it down to concrete panel sides but instead we decided to build a lean to on it to hold a few extra sheep. Nice and airy enough for them. Only thing is when it’s raining and blowing from the south water is driven up the sheets, under the gutter and drips down where they both join. Obviously in hindsight we would have built a one big monopitch shed 60x100...but hey ho
 

Danny1888

Member
Livestock Farmer
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.
I was quoted IPE 200x100x22.4kg/mtr.
Last piece of the puzzle is this the right thickness rail ?????
 

Will Do.

New Member
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
Is that a better/stronger way of bolting rafter and upright as
opposed to bolting the rafters on top of the upright?
 

Danny1888

Member
Livestock Farmer
I have it all locked down bar 1 detail.
Going 25ft wide now and got quoted for 22.4KG/MTR beam. What are peoples thoughts on this ???
 

7610 super q

Never Forgotten
Honorary Member
Would folks trust the Tec screw holes not to leak on shallow pitches ? I was told to screw them through the troughs rather than the ridges ( box profile ). Didn't like doing it. Washers will perish eventually ?
 

mixed breed

Member
Mixed Farmer
Would folks trust the Tec screw holes not to leak on shallow pitches ? I was told to screw them through the troughs rather than the ridges ( box profile ). Didn't like doing it. Washers will perish eventually ?
Me being of dubious education, my neighbour said I was thick for putting the "nails" in the cleavage, rather than the tit, but that was the advice given. Coming from a background where grandfather would mend leaky galv tanks with a bolt and two bits of welly I concluded the theory is correct, I guess the force that they are screwed in at helps them seal. Time will only tell on the perishing bit.
 
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Ffermer Bach

Member
Livestock Farmer
Being of dubious education, my neighbour said I was thick for putting the "nails" in the cleavage, rather than the tit, but that was the advice given. Coming from a background where grandfather would mend leaky galv tanks with a bolt and two bits of welly I concluded the theory is correct, I guess the force that they are screwed in at helps them seal. Time will only tell on the perishing bit.
in my experience the "dowty" washers in the valleys on the box profile sheets on my lean to have all been fine and not leaked, also the hill in the profile is not strong enough to support itself if a screw were put in it.
 

mixed breed

Member
Mixed Farmer
in my experience the "dowty" washers in the valleys on the box profile sheets on my lean to have all been fine and not leaked, also the hill in the profile is not strong enough to support itself if a screw were put in it.
Yep, plus its quick and easy, we did one of those farmplus sheds a few years back for some horse folk, the box profile had 4inch nails and spats with the instructions, nail through on the high side. Had to drill holes for them first, and nail down softly as the tin would just crumple. Quite a ballache.
 

Mur Huwcun

Member
Livestock Farmer
Location
North West Wales
Is that a better/stronger way of bolting rafter and upright as
opposed to bolting the rafters on top of the upright?

It's the way portal frames are usually built as the haunches are there to stop the rafters twisting. I have also just in case welded 40x10 flat bar into the web of the stanchions where the rafter and haunch is to stop the column twisting with roof loadings. I've also seen buildings done with the rafter on top but still using a haunch and have seen them just welded on top but I wanted a belt and braces job as I was doing it myself rather than buying a kit therefore did it once and hopefully did it right!!! The price difference per meter between 7x4 and 8x4 UBs were only a few pounds.
 

Danny1888

Member
Livestock Farmer
Right lads this is the locked down dimensions. 7.6 x 9.1. Have it up to 10degree pitch. My last worry is the centre beam at a 25ft span. Planning on ip200x100x22.5. I am going to drop 100x100 on wall sides to halve them spans. And gusset the centre span hopefully shorten it to 18ft. What so people think ???
Screenshot_20201209-231209_WhatsApp~2.jpg
 

Cmoran

Member
Livestock Farmer
Location
Galway Ireland
Right lads this is the locked down dimensions. 7.6 x 9.1. Have it up to 10degree pitch. My last worry is the centre beam at a 25ft span. Planning on ip200x100x22.5. I am going to drop 100x100 on wall sides to halve them spans. And gusset the centre span hopefully shorten it to 18ft. What so people think ???View attachment 926018
I’m after doing a 30’ lean to with 7x4 rsj and 2’6” pitch no need for middle rsj but we don’t get much snow here
 

Mur Huwcun

Member
Livestock Farmer
Location
North West Wales
As below. Thanks in advance

First use an online calculator to calculate your roof pitch, I just usethis one


That gives you then an idea of what you can use.
Although it’s just a log store I would go for 7*3 timbers if you’re going for full span as 6*3 will sag a lot. No need for the rafters to be silly steel if you can use gable posts aswell. Even two timber perlins screwed together would do if you don’t get a lot of snow and wind etc. Columns depend on what way you will fix them to rafters etc.
 

Dave eire

Member
Livestock Farmer
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.
That's a fine shed
 

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quote: “Red Tractor has confirmed it is dropping plans to launch its green farming assurance standard in April“

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