building a Lean To

Google comes up with lots of different instructions on building a Lean to, so I'm boggled with ideas now.

I want to stick what essentially is a car port / lean to, on the side of the house its 7 foot wide, has gates at each end of the run, the side of the house is approx 9 mtrs, the lean to will run the full length.

I intend to use 4x4 posts, 5 of them as the supports 2 mtrs apart then 4 x 2 rafters 500mm ctrs all the way down. what do I put (if anything) on the wall to support the raftes? can I just use hangers or do I need to put a 6x1 plate of similar the full length of the house? and I suppose similar on the 5 upright posts to support the joists or is there another way?

Also, I didn't intend to lead flash the roof to the wall, its not meant to be water tight so will a plastic sloped roof give any issues if I allow water to run down the wall of the house? if it is an issue, is there any product I could use instead of lead flashing? some form of rubber sticky stuff ?

Any tips for the hard plastic roofing?

TIA

Reply to
Vass
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Assuming the house is brick I would go with a plate as much easier to fix the joist hangers

Use Aquaseal flashing instead of lead

Or if the sheets are across the lean-to rather than along get a profile flashing e.g screwfix code 62744 ( assuming that you are using corrugated sheet

Regards

Reply to
TMC

yes higher on brick house wall, down to lower where the posts are by neighbours fence along length of side of house.

OK, what size plate?

Never heard of it, but will google thanks :-)

was thinking twinwall hollow polycarbonate sheets

Reply to
Vass

Google comes up with lots of different instructions on building a Lean to, so I'm boggled with ideas now.

I want to stick what essentially is a car port / lean to, on the side of the house its 7 foot wide, has gates at each end of the run, the side of the house is approx 9 mtrs, the lean to will run the full length.

I intend to use 4x4 posts, 5 of them as the supports 2 mtrs apart then 4 x 2 rafters 500mm ctrs all the way down. what do I put (if anything) on the wall to support the raftes? can I just use hangers or do I need to put a 6x1 plate of similar the full length of the house? and I suppose similar on the 5 upright posts to support the joists or is there another way?

Also, I didn't intend to lead flash the roof to the wall, its not meant to be water tight so will a plastic sloped roof give any issues if I allow water to run down the wall of the house? if it is an issue, is there any product I could use instead of lead flashing? some form of rubber sticky stuff ?

Any tips for the hard plastic roofing?

just found this which is almost identical to my intended build

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Reply to
Vass

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practical experience is limited to corrugated sheets which I have used for many years

And I guess that an expert will be along soon

I would always use 2" thick timber with the width (for the wall plate) dependant on the type of joist hanger used

You may get away with thinner but the recommended nails for the joist hangers (Square Twisted Sheradised Nails) are normally 30 mm long

Regards

Reply to
TMC

Vass presented the following explanation :

If you don't use some sort of flashing, then the water will run onto the wood - which is never a good idea. You can get stick on flashing, but it doesn't work well on a corrugated profile. It works absolutely fine stuck to a flat surface though. We used it as a second and third layer on top of proper lead flashing around our chimney, which tended to leak slightly. No leak now.

Reply to
Harry Bloomfield

If you don't use some sort of flashing, then the water will run onto the wood - which is never a good idea. You can get stick on flashing, but it doesn't work well on a corrugated profile. It works absolutely fine stuck to a flat surface though. We used it as a second and third layer on top of proper lead flashing around our chimney, which tended to leak slightly. No leak now.

excellent, was going for the flat polycarbonate 10mm sheeting ta for the tip

Reply to
Vass

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