We currently have a lean-to extension at the rear of our house: the dining room and kitchen make an L-shape and the lean-to sits between these and the neighbour's wall. Therefore the construction of the lean-to is simply one door and a panel at the end with a corrugated plastic roof.
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..............................|.....................|....Kitchen..|
Neighbour's house | Lean-to ......|..................|
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..............................| Dining room.....................|
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Its dimensions are approximately 150cm wide by 330cm long.
The lean-to is not well constructed and was here when we bought the house. It lets a lot of rainwater in and the timber supports along the walls are rotten.
We plan to dismantle the lean-to and rebuild it.
A soil pipe goes through the current corrugated plastic roof and this is the source of many leaks as it is not well flashed, and so I assume that a large timber beam will be attached to the wall past the furthest point of the soil pipe and the roofing to start here, so that the roof does not have to be cut, and then the timber will be flashed.
We have had some extortionate quotations from windows and conservatory companies, but this may be because they want to build it in the style of a conservatory with uPVC etc. All we are looking for is something that is waterproof and keeps the heat in. And thus I plan to do this myself.
I plan to attach two long pieces of timber against the walls and one against the dining room wall. I will then use 25mm polycarbonate for the roof but all the diagrams and help guides I've seen on this forum and on the net show the polycarbonate running vertically downwards. With the set up we have, we won't have vertical rafters, we will instead have three horizontal purlins. Now because of this, how will the roof be fitted? Will the roof run vertically? If condensation builds up, it will run down the inner then leak through at the purlin. If we fit the sheets horizontally, any condensation won't run off at all. Should we use timber purlins at all: can self support bars be used?
Another concern I have is that the roof will need flashing. Of course against the dining room wall the roof sits flush and can be flashed easily (albeit with what kind of flashing? And how?). But where the roof slopes downwards, how will this be flashed against the length of the wall? The flashing can't be inserted into the mortar as it slopes downwards at an angle.
Any help would be appreciated. Or indeed any builders in the Great Yarmouth area who would be able to do this work for us at a reasonable price, do get in touch. Thanks.
________________
..............................|
..............................|_____/|____|""""""""""""|
..............................|.....................|....Kitchen..|
Neighbour's house | Lean-to ......|..................|
..............................|.....................|.................|
..............................|.....................|.................|
..............................|__________|_________|
..............................|........................................|
..............................| Dining room.....................|
..............................|........................................|
..............................|........................................|
Its dimensions are approximately 150cm wide by 330cm long.
The lean-to is not well constructed and was here when we bought the house. It lets a lot of rainwater in and the timber supports along the walls are rotten.
We plan to dismantle the lean-to and rebuild it.
A soil pipe goes through the current corrugated plastic roof and this is the source of many leaks as it is not well flashed, and so I assume that a large timber beam will be attached to the wall past the furthest point of the soil pipe and the roofing to start here, so that the roof does not have to be cut, and then the timber will be flashed.
We have had some extortionate quotations from windows and conservatory companies, but this may be because they want to build it in the style of a conservatory with uPVC etc. All we are looking for is something that is waterproof and keeps the heat in. And thus I plan to do this myself.
I plan to attach two long pieces of timber against the walls and one against the dining room wall. I will then use 25mm polycarbonate for the roof but all the diagrams and help guides I've seen on this forum and on the net show the polycarbonate running vertically downwards. With the set up we have, we won't have vertical rafters, we will instead have three horizontal purlins. Now because of this, how will the roof be fitted? Will the roof run vertically? If condensation builds up, it will run down the inner then leak through at the purlin. If we fit the sheets horizontally, any condensation won't run off at all. Should we use timber purlins at all: can self support bars be used?
Another concern I have is that the roof will need flashing. Of course against the dining room wall the roof sits flush and can be flashed easily (albeit with what kind of flashing? And how?). But where the roof slopes downwards, how will this be flashed against the length of the wall? The flashing can't be inserted into the mortar as it slopes downwards at an angle.
Any help would be appreciated. Or indeed any builders in the Great Yarmouth area who would be able to do this work for us at a reasonable price, do get in touch. Thanks.