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PostPosted: Sun Jan 14, 2018 1:39 am 
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Hi Everyone,

First post so please be kind :-)

Seeking some advice to change my corrugated roof to a flat felt system. My garage is joined to the neighbours.

Currently the plan is to remove the roofing sheets, add a new lintel over the garage opening, add strengthing battons every 4ft to the roof. Deck out with 18mm exterior plywood and 3 layers of felt with a vapour barrier layer.

A couple of things im not sure about:

Where the flat roof meets the neighbours roofing corrugated sheet, how to go about finishing the edge to ensure there is a waterproof seal? Would it be best to felt over it or use some sort of sealent?

Currently the concrete lintel sits behind the solder bricks, I've uploaded images to show the bricks and existing lintel, would it be best to remove the bricks and replace them with the lintel or sit the lintel behind the bricks?

https://ibb.co/neb4cR
https://ibb.co/jYqmrm

On the edge of the roof sides, I was going to use 2x1 battons and finish the felt around it, would it be better to use an edging product?

Does anyone have a recommendation for roofing felt?

Any feedback would be much appreeciate. Thanks J


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PostPosted: Sun Jan 14, 2018 11:25 am 
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i cant open the photos.
photos showin the wholeroof surface and rafters/joists would help.
unless theres a parapet dividin wall
what you propose can be v. difficult to do without causing problems even leaks for your neighbour.
is there asbstos in the sheeting?


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PostPosted: Sun Jan 14, 2018 12:08 pm 
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The shared garage on the roof doesnt have a parapet dividing wall.
Luckily or by design the corrugated sheets are not shared, so no cutting would be required.

Image

The roof is concrete asbestos, but I am aware that as long as precautions are taken and the sheets are not broken or damaged then this is not an issue as long as they are double bagged and taken to the recycle center.

I've uploaded a photo showing the roof line.
[img]
https://image.ibb.co/b9wsxR/20180113_120851_2.jpg
[/img]
Thanks


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PostPosted: Sun Jan 14, 2018 5:22 pm 
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i cant open your photos but the photo shown only shows what looks like a car port with plastic corrugated sheets and a top opener doorwhats needed is a photo showing both garage roofs from above


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PostPosted: Sun Jan 14, 2018 5:35 pm 
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Image

I've been told that epdm might be the best option to ensure a good seal to the neighbours roof.
Hopefully the photo should now work.


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PostPosted: Sun Jan 14, 2018 9:17 pm 
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Personally I'd just replace the corrugated roof panels (steel, pasticoated, flocked). Cheaper in the first instance and longer lasting in the second.

If condensation (under) is an issue then there are coatings that work.

Felt has limited lifetime and is, imho, inferior to the corrugated solution.

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PostPosted: Sun Jan 14, 2018 10:33 pm 
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Would the bitumen sheets be strong enough or would opting for the plastic coated steel be the better option?
I'm thinking if its replaced with these sheets then it wouldnt need to be decked out?

Seems like a lot simpler route and cheaper and no lintel would be needed.
I think it would be wise to use a condensation layer.

Thanks for the suggestion.


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PostPosted: Mon Jan 15, 2018 7:39 pm 
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still dont know which is your total roof and where the neighbours roof is in the photo?
still havent seen looking up inside the garage at the rafters.
your sheeting has been flashed with a fillet of mortar instead of lead or custom corrugated flashing peicecs.
the join with the neighbouts roof needs to be shown to help yu.
why do you want to mess with your door lintel?


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PostPosted: Mon Jan 15, 2018 9:25 pm 
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The line from the carport is the dividing line. If you zoom in you can see where the sheet overlaps the divide.
Ill try to add a line on the photo and also one of the underside of the rafters. Looks like they are separated by 1.2m.

As per the lintel, I was informed by a builder if they were to do the roof they would add a lintel to take the additional weight.


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PostPosted: Tue Jan 16, 2018 6:53 pm 
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Here's the photo of the sharing line.

Image


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PostPosted: Sun Jan 28, 2018 7:17 pm 
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This is a side view of the mantel, what concerns me is the bricks are attached to the mantel and have dropped.

As the bricks had no support underneath which could be the reason they've dropped. (The bricks were installed before the garage door frame was fitted), or possibly the mantel issue??

There is a horizontal crack on the 'casted in situ' lintel inteslf that stretches the entire length of it.

Image


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