Discussion
My new 'manshed' is to have a sloping roof, about 1ft drop over 20ft length, it'll be a timber construction with an OSB board roof.
I plan to felt the roof. Do I brush on tar then lay the felt down?
Assume I start at the low end and overlap a few inches on top of the previous sheet?
Avoid nails in the top, just use those galv nails along the sides?
Any tips?
I plan to felt the roof. Do I brush on tar then lay the felt down?
Assume I start at the low end and overlap a few inches on top of the previous sheet?
Avoid nails in the top, just use those galv nails along the sides?
Any tips?
for my dad's we used bitumised chip board and melt on felt and good as gold 20 years later. for mine I used OSB and painted on bitumen and melt on felt. The melt on stuff is really good, but you need a felt burner (£10?) gloves and an assistant.
Did two layers of felt, one layer 'up' the roof, the second across, starting from the bottom as you say, working up. do the side upstands next and the rear up stand last.
We started off by laying the first layer flat to the edge of the roof, then the second was nailed back to front along the front lower edge and the turned up and melted back on itself to provide the drip break and then up and over the roy to provide the lower strip. easier to do that describe...the hardest thing to do is not to heat the felt up too much or you'll ut your fingers through it and ruin it, but it's not hard to do...
good luck.
Did two layers of felt, one layer 'up' the roof, the second across, starting from the bottom as you say, working up. do the side upstands next and the rear up stand last.
We started off by laying the first layer flat to the edge of the roof, then the second was nailed back to front along the front lower edge and the turned up and melted back on itself to provide the drip break and then up and over the roy to provide the lower strip. easier to do that describe...the hardest thing to do is not to heat the felt up too much or you'll ut your fingers through it and ruin it, but it's not hard to do...
good luck.
Laughing at "Melt on felt" 
You will find when you buy mineral finish, it has a sevedge on it, its the lap required.
Clout nail an underlay on then cold bond the mineral on if you don't want to use 'Torch on' felt.
Water should always run off lap. Wind will rip cheap felts off quite easily if exposed area.
You will find when you buy mineral finish, it has a sevedge on it, its the lap required.
Clout nail an underlay on then cold bond the mineral on if you don't want to use 'Torch on' felt.
Water should always run off lap. Wind will rip cheap felts off quite easily if exposed area.
roofer said:
Laughing at "Melt on felt"
You will find when you buy mineral finish, it has a sevedge on it, its the lap required.
Clout nail an underlay on then cold bond the mineral on if you don't want to use 'Torch on' felt.
Water should always run off lap. Wind will rip cheap felts off quite easily if exposed area.
Been about 10 years since I used melt on felt...what are they going to change the name of next? ;-)You will find when you buy mineral finish, it has a sevedge on it, its the lap required.
Clout nail an underlay on then cold bond the mineral on if you don't want to use 'Torch on' felt.
Water should always run off lap. Wind will rip cheap felts off quite easily if exposed area.
I've just used this
http://www.rubba-seal.co.uk/
Very simple to install and I really liked that you have no joins for the water to get in to.
http://www.rubba-seal.co.uk/
Very simple to install and I really liked that you have no joins for the water to get in to.
virgil said:
roofer said:
Laughing at "Melt on felt"
You will find when you buy mineral finish, it has a sevedge on it, its the lap required.
Clout nail an underlay on then cold bond the mineral on if you don't want to use 'Torch on' felt.
Water should always run off lap. Wind will rip cheap felts off quite easily if exposed area.
Been about 10 years since I used melt on felt...what are they going to change the name of next? ;-)You will find when you buy mineral finish, it has a sevedge on it, its the lap required.
Clout nail an underlay on then cold bond the mineral on if you don't want to use 'Torch on' felt.
Water should always run off lap. Wind will rip cheap felts off quite easily if exposed area.
I've been thinking a bit more about this shed roof. Options are:
OSB and felt - expensive
OSB and rubber - even more expensive
Corrugated galv steel or pvc coated priled sheet - cheap, condensation? noise? shed is a funny tapered shape and sheets would need trimming exposiing bare steel compromising the integrity of the coating.
Other options?
What about clear GRP? Too hot in summer?
OSB and felt - expensive
OSB and rubber - even more expensive
Corrugated galv steel or pvc coated priled sheet - cheap, condensation? noise? shed is a funny tapered shape and sheets would need trimming exposiing bare steel compromising the integrity of the coating.
Other options?
What about clear GRP? Too hot in summer?
Have a look at onduline,I think wickes stock it. It should last well over 20 years is fixed correctly with capped screws. I had a corrugated metal roofed extension on my garage and it suffered condensation which dripped onto the car underneath, but should be ok if you are laying it on osb sheeting.
You do know you get box profile sheets with anti condensation backing now?
I've came across that onduline a couple of times and the stuff is crap and the last time the wind got underneath it and tore most of it up.
What about cement fibre sheets which are not too bad ..... Which looks like old school asbestos but without the nasty health issues.
I've came across that onduline a couple of times and the stuff is crap and the last time the wind got underneath it and tore most of it up.
What about cement fibre sheets which are not too bad ..... Which looks like old school asbestos but without the nasty health issues.
Edited by van cleef on Sunday 7th October 17:16
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