Hi, can someone offer any advice on how to weather in where my new extension joins my existing pitched roof? I will obviously cut tiles to fit up against fascia and under soffit. Does the fascia go into the roof or up to tiles? I assume some sort of leadwork to cover it all but not sure how to go about it.
Flat roof corner joining existing pitched
- Thread starter diybsp
- Start date
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i cant work out how you've framed the flat roof or whats happening on the RH fascia side?
is there a lintel below the rafters where they enter the pitched roof?
if you remove any obscuring plastic and stand well back and do a few pics showing where the flat roof hits the main roof, and the RH side, it would help?
is there a lintel below the rafters where they enter the pitched roof?
if you remove any obscuring plastic and stand well back and do a few pics showing where the flat roof hits the main roof, and the RH side, it would help?
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One would carcass the flattie facia detail, then repair the pitched roof up to the carcassing - i.e. cut roofing battens back, lay felt lapping up the timber, fix battens, and fix tiles (with soakers if necessary) and an abutment flashing, then cover with décor fascia. If the existing pitched roof overhang is such that it abuts below the fascia line then you would need to chase your abutment flashing into the masonry. Can get a bit fiddly as you get closer to the soffit of the flattie - but doable.
It's sometimes easier/better to cut the carcassing back and at the same pitch of the roof and a few cm shy, then tile as high up the roof as you can beneath the carcassing, depending on how yours works.
We recently did one on this fella where the flattie hits the pitched....
It's sometimes easier/better to cut the carcassing back and at the same pitch of the roof and a few cm shy, then tile as high up the roof as you can beneath the carcassing, depending on how yours works.
We recently did one on this fella where the flattie hits the pitched....
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I was referring to the pitched roof abutment where the pitched hits the flattie. You need to get this right and get it done (up to the pint where the flat roof lead soaker is dressed onto the tiles) before you do the flat roof covering.
Always start at the lowest point. You will need to remove battens and repair felt complete with upturn, soaker, tile, abutment flash right up to where you will be level with the flattie. You will then complete the flat roof (with soaker onto the tiles) along with an upturn tray and cocking fillet going up the roof, then complete the tiling.
Your fascia can be fitted last over the pitched roof soakers. We fix a 15mm strip of OSB around the flattie, so that the roofer can tack his flat roof flashing strips to the OSB, allowing us to slot the facia up beneath his flashing....
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see youtube "video's on EPDM.
the sketch above is good but not accurate enough for your situation.
determine how you intend to transition from flat roof to main roof.
your "flat roof" appears to be too flat - does it have falls? whats the ratio?
the gutter obviously needs cleaning, stop ending & fixing to falls.
have you sorted the down pipe drop(s) for the flat roof gutter?
why is your flat roof so deep?
the sketch above is good but not accurate enough for your situation.
determine how you intend to transition from flat roof to main roof.
your "flat roof" appears to be too flat - does it have falls? whats the ratio?
the gutter obviously needs cleaning, stop ending & fixing to falls.
have you sorted the down pipe drop(s) for the flat roof gutter?
why is your flat roof so deep?
Lost count how many videos ive seen on flat roofs and epdm, think im quite happy about how its going to be fitted its just that corner where it meets the pitched part seems a tricky detail. I'm thinking the lead needs to be cut flush with the top of the flat roof deck then epdm folds over it? But then does it need a bit of lead over the top of that?
Roof has a good fall, its 150mm joists/3" firings/18mm osb/VCL/120mm insulation/18mmOSB. Didn't actually think it was that deep! I actually left the exterior brick course higher with smaller noggins around the edge so I could have a smaller fascia.
Roof has a good fall, its 150mm joists/3" firings/18mm osb/VCL/120mm insulation/18mmOSB. Didn't actually think it was that deep! I actually left the exterior brick course higher with smaller noggins around the edge so I could have a smaller fascia.
i've just tried to describe what we would do (eg we most always use tilt angles for edging) in answer to your questions but, for me anyhow, its too complicated and would need sketches - which i dont know how to do. so i've scrubbed what i'd written.
why not contact a roofer by sending him the above thread for a heads up - and whoever accepts could come on site, and either do it their way or show you how to do it?
why not contact a roofer by sending him the above thread for a heads up - and whoever accepts could come on site, and either do it their way or show you how to do it?
That lead needs dressing over a kerb rather than directly onto the flat roof.
This is what I'm fitting - https://www.rubber4roofs.co.uk/shop/sure-edge-kerb-trim-2-5m which compresses down onto the epdm and also covers the top of the fascia.
The people at rubber4roofs did say I could stick the epdm to the lead as it was but I think it would be better and I would prefer it bonded directly to the osb.
Seen a few pictures like this - https://seriesaroofing.com/wp/wp-co...bond-flat-roof-wandsworth-london-673x379.jpeg which dont seem to have anything.
The people at rubber4roofs did say I could stick the epdm to the lead as it was but I think it would be better and I would prefer it bonded directly to the osb.
Seen a few pictures like this - https://seriesaroofing.com/wp/wp-co...bond-flat-roof-wandsworth-london-673x379.jpeg which dont seem to have anything.
noseall, that works but there's only a short run of lead, & the lead would have to be nailed to the kerb.
i'd suggest flapping the EPDM over the kerb and fixing more or less as you've shown in your sketch.
OP, yes, i know about them but how long will that cushioned strip survive before allowing water through?
"dont seem to have anything" - yes, the EPDM roof does, it has custom edging pieces (or kerbs as noseall says) with the EPDM nailed to the edgings.
neither of the roofs appear to have angled tilt fillets to flow the material up the kerb upstands?
tilt fillets eliminate the 90 degree weak point.
i'd suggest flapping the EPDM over the kerb and fixing more or less as you've shown in your sketch.
OP, yes, i know about them but how long will that cushioned strip survive before allowing water through?
"dont seem to have anything" - yes, the EPDM roof does, it has custom edging pieces (or kerbs as noseall says) with the EPDM nailed to the edgings.
neither of the roofs appear to have angled tilt fillets to flow the material up the kerb upstands?
tilt fillets eliminate the 90 degree weak point.
Not got an issue with the edge trim or epdm as such its just where the corner of the flat roof meets tiles is my main concern(maybe overthinking it?!) This explains what I mean - https://www.mig-welding.co.uk/forum/threads/epdm-flat-roof-join-pitched-roof.62546/
This image https://www.mig-welding.co.uk/forum/attachments/20160317_181804-jpg.81146/ shows it.
This image https://www.mig-welding.co.uk/forum/attachments/20160317_181804-jpg.81146/ shows it.
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