Water membrane

S

sue25

Joined
9 Aug 2009
Messages
6
Reaction score
0
Location
Lancashire
Country
United Kingdom
Hi,

I have had a green roof put on my shed. There is a water membrane with 30 holes punctured in it at the base of the slope to let water through the drilled holes of a facia board into the guttering.

The plywood roof has been partly protected by bitumen paint. Water is now finding its way back up underneath the membrane on to unprotected plywood.

I am going to put another coat of bitumen and increase the coverage but is there a method of sealing the membrane holes that would allow the water (with a pipe attachment) staight into the guttering. Screwfix and B&Q have been no help.

I am worried the plywood roof will rot! It is one inch thick. Would the bitumen be sufficient if there isn't a fixing?
 
Sponsored Links
any chance of posting a pic of this set up sue ? having difficulty understanding what has been done and what you wish to achieve.
 
I have put photos on an album on my profile. Is that the way to do it?[/img]
 
Sponsored Links
View media item 13590
View media item 13592
View media item 13591 :eek: :eek: :eek:

errm what is that set up? i have never seen anything like it :confused: did you do it yourself ?

to what purpose does it serve? is it supposed to be to recycle the rainwater?

sorry sue i'm at a loss with that one! maybe one of the other guys knows of some new invention thats by passed me.

anyway that detailing can never be made watertight or functional imo.

beat me to it freddy......... :confused:
 
drop the height of the leading edge of the front fascia board and run the felt straight into the gutter.
 
The fleece keeps the soil/substrate in place. It is above the membrane layer. Would some sort of coupling do the job? ie getting water through the membrane and dropping in the gutter.

If I dropped the front what would keep the soil in place?

My brother in law did the job, it was his first attempt at a green roof. It is not finished yet as we have this small issue to sort! PS He is a builder.
 
sue25 said:
My brother in law did the job, it was his first attempt at a green roof.
Click to expand...
And his last with a bit of luck! :LOL:

I would try and get the gutter inboard of the fascia with the 'water membrane' dressed directly into it, trying to get the water to find its way through the construction like that is a recipe for disaster as you have found out. It will need some kind of mesh to stop it filling with earth of course but you'll probably need to periodically check it hasn't blocked up. Or get him to try and make up something like this:

skytrenches-ecoroofs_everywhere_detail.jpg
 
One simple idea that should work is to drill out those holes to the size of some easily available plastic pipe (conduit/overflow etc). Lubricate the holes with silicone sealant then insert the pipe (must be tight fit) from the roof down into the gutter. That should be a watertight fit if you do it correctly.
 
[I would try and get the gutter inboard of the fascia with the 'water membrane' dressed directly into it, ][/quote]

I think this is the easiest remedy trying to sort the mess we are in, combined with drilling tight holes for the pipes through the facia.

The main question is if I cut the membrane so it is tight to the facia, can I stick it down with anything to try and stop any water going back up underneath itself? Any recommendations?

Many thanks for your help.
 
I'm not quite sure what you mean tbh but anyway if the gutter is behind the fascia sat on top of the existing deck, out of sight so to speak, with the membrane dressed into it, (you would need a fillet piece of timber to stop the membrane draping) then the water can flow directly into the gutter and it will never get under the membrane in the first place. As mentioned you will probably need to move the fascia further out so that the downpipe can run vertically through the soffit below as the soffit at the moment looks too narrow. Otherwise I don't see how the downpipe can get out, unless you had one end of the gutter poking out at one end which would look a bit of a bodge. (previous colossal bodges forgiven! :LOL: )

Edit: having just re-read your last post, to sum up, trying to sort this by drilling holes in bits of wood for drainage is a right bodge and you'll end up with the same problems you have now. Fix the UPVC gutter behind the fascia, dress the membrane into it and drain it with a downpipe through the soffit.

Untitled

Untitled

 
Exit holes??

My foot would be finding it's way into the exit hole of anyone who did this to my roof!
 
Hi freddy, have a method that may help this post. But need advise on, making and posting sketch. Can you advise?
 
justlead1 said:
Hi freddy, have a method that may help this post. But need advise on, making and posting sketch. Can you advise?
Click to expand...

You mean advise on doing a drawing? I'm not sure I get your drift! If thats what you mean, you can't beat a hand drawn sketch and a photo of it.
 
D

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
You must log in or register to reply here.
Sponsored Links

Similar threads

T
breathable roof membrane and valley gutters - what to do?
2
Replies
19
Views
43K
BethesdaSlate
B
A
Synthetic Slate Lean To
Replies
11
Views
2K
catlad
C
R
Roof leak between extension and garage
2
Replies
15
Views
2K
datarebal
D
T
Thoughts about upvc facia
Replies
2
Views
668
^woody^
^woody^
R
Condensation on breathable membrane
Replies
3
Views
286
Richards303
R
Back
Top