DIY help

Discussion in 'Help with all other issues' started by andyBeaker, Aug 20, 2018.

  1. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    i am half way through building a bespoke bike store for my son at his place. The roof will be a single pitch made from 18mm OSB covered in felt. Perfectly happy using OSB in this situation, can't justify using decent (expensive!) marine ply.

    The issue I have is more one of finishing the job neatly. Where the roof butts up to the house I will need to make three cut outs to accommodate various downpipes. I can't really see how I can get the felt to look neat in these areas and would like to find some trim of some sort to tidy up the cut outs. I suppose in my mind the cut outs will look best if they mirror the shape of the pipes but I suppose they could be square - which I suppose would allow the use of right angle upvc channel or similar.

    Any thoughts?

    Ps I am aware that the edges of the OSB need to be sealed for best protection.
     
  2. sr71caspar

    sr71caspar B̶a̶n̶n̶e̶d̶ Club Sponsor

    Have you looked into Firestone rubber roofing sheet rather than felt? You should be able to bond circular cutouts around, and up, the downspouts- vulcanised like a puncture repair. Should last at least twice as long as felt anorl.
     
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  3. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    IMG_1287.JPG IMG_1288.JPG Photos might help...... board and felt temporarily in place to keep the board dry!! The timbers are there to keep everything in place until I go back too finish the job.

    The board will be going further back to within half an inch of the wall, hence the need for cut outs round the pipes.
     
  4. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    Appreciate that(y).

    As you can see,from the photos I am committed to the felt approach - they will be selling the place in a couple of years so felt will do - as the roof is at pretty low level and overlooked by the kitchen window green felt will be easier on the eye.
     
  5. sr71caspar

    sr71caspar B̶a̶n̶n̶e̶d̶ Club Sponsor

    If they're selling in a couple of year's, I wouldn't worry too much about finishing it nicely- the new owners will probably rip it out.
     
  6. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    You can never have too much storage in Central London!

    Anyway, I like to do a good job - this structure is massively over engineered!! Drilling sixteen 12mm holes in Victorian bricks was one of my greatest achievements!!
     
  7. sib8292

    sib8292 Well-Known Member Club Sponsor

    It's never going to be entirely sealed, plastic pipe expands and contracts and will open up the joint, but have you thought of using a lead flashing? You could have a collar up the pipe by about 100mm and a patch on the roof surface then solder the two together.

    Or you could just use some silicone mastic round the pipe, cut a felt patch to cover it and hope it lasts long enough...
     
  8. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    Thanks for the suggestion. I don't want to create a seal between the house and / or the pipes the roof, will leave about 15mm gap for the water from the wall to run down - it's a Victorian house and the walls are pretty wonky and crumbly so any attempt to make a seal is doomed to failure!
     
  9. Squag1

    Squag1 Been there, and had one Club Sponsor

    Reroute the pipes.
    Could definitely reroute r.h. r.w.p

    Gonna make room very dark.
     
  10. slim63

    slim63 Never surrender Club Sponsor

    I can be sealed easily enough if you really want ?

    Denso tape along the join & around the pipes, its horrible stuff to use but effective & will give a little with expansion & contraction then you can flash over it with lead or flashband to make it look tidy but don't fix either to the roof or it wont give

    The other is expanding foam in the gap then cut back & cover as above

    Re OSB board yes you need to seal all edges with bitumen paint a good 3 to 4 inches in from the edge but any moisture that gets under the felt will still rot it eventually, once the board is cut to size I seal it with fence guard or similar (2 coats) before doing the edges with bitumen & fitting it, lasts 3 times as long that way
     
  11. derek kelly

    derek kelly The Deli lama Club Sponsor

    If you weren’t committed to felt I would have suggested onduline.
     
  12. Cougar377

    Cougar377 Express elevator to hell Club Sponsor

    Why not just buy a plastic or metal bike shed..? Then he could take it with him when he goes....
     
  13. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    Custom built was the only thing that would,work.

    I have another day booked to finish it later this month....pictures to follow.

    I think I may have overengineered it somewhat.......:naughty:
     
  14. Jaws

    Jaws Corporal CockUp Staff Member

    Roofers use a stick on stuff that looks like tin foil !
    Sticks like dog poo on a wedding dress............. Ours has been in place 10 years now and is still totally
     
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  15. slim63

    slim63 Never surrender Club Sponsor

    Flashband !

    Good stuff if used properly ! if the wall is as crubbly/dusty as Andy says it needs priming first though or it will come away sooner rather than later
     
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  16. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    A good shout....but as mentioned before I am not looking to seal against the wall as it is a wonky Victorian house and I can't see it being effective. Don't really want to mess with the brickwork as it isn't brilliant. It is well over 100 years old.

    I have left a gap of about an inch between the wall and the roof, sealing the edge of the OSB and folding the felt around it and sticking and nailing in place. For the cutouts where the pipes are I have sealed with felt and adhesive as best as I can then put some upvc right angle moulding over it and stuck/sealed with multigrip.

    Unfortunately the moulding is white, would have preferred black but the black was over £40 for four metres compared to £6 for white!!

    Finishing the job next weekend, so will post up pictures then!!
     
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  17. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    29334f09-c2d7-4d38-87a5-dab5e1bdf368.jpg 0fe0c475-f4b5-4e20-972f-300865f44084.jpg And here is the final result.....well almost...managed to bust one of the tabs on the guttering so it looks a bit wonky at the moment.

    I think it will look nice when the hideous orange troughs are filled with soil and some nice planting, plus a coat of sealer over the decking...as you can see, it was pissing down when I finished it off on Sunday :(
     
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  18. Squag1

    Squag1 Been there, and had one Club Sponsor

    Neat (y)
     
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  19. slim63

    slim63 Never surrender Club Sponsor

    That's a tidy job :thumbsup:

    The only thing I would have done different is seal the cut ends & joints as I went along, its a bit of a faff but makes for a much longer lasting structure ;)
     
  20. andyBeaker

    andyBeaker Moderator Staff Member Moderator Club Sponsor

    I agree.

    I only had green stain/sealer with me so all hidden joints were done as I went along.

    Son has the onerous task of putting a couple of coats of sealer over the whole lot.

    Downside is the mrs now wants me to build her a raised herb garden at home:aaaaa:
     
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