Membrane help

[jamieled]

I've used tyvek housewrap on my frame. The joiner reckons it's usual to use something different on the roof. I'd tend to agree but only as I haven't seen any frames near us using the same stuff on the roofs and the walls.

 

Should I be using something different on the roof, and if so what are the main differences between main house membrane and roofing membrane?

[LA3222]

Yeah @jamieled, it should be tenting/non tenting type I believe.  It is dependent upon if you have a cold or warm roof setup.

 

There will be loads of info on this in the roofing section.

[Thedreamer]

@jamieled we used roof shield. 

 

There a video in the link below that shows how it works.

 

https://www.proctorgroup.com/products/roofshield

 

From my understanding with a lot of roofing membranes the problem is when they get fitted in frosty conditions.

[Cpd]

11 minutes ago, Thedreamer said:

From my understanding with a lot of roofing membranes the problem is when they get fitted in frosty conditions.

This is very true and I used roofsheild and then it got wet and froze, completely destroyed the waterproof quality’s of the product....... 

[Ed Davies]

I have a similar question to @jamieled:

 

I've used TF200 on my walls (and around my window reveals). It's stood up nicely to long exposure, about 18 months for the oldest bits. Ideally, I'd like to use it to replace the failed stuff on my that failed when it got wet and froze. I can't see the point of a membrane which can't stand freezing when it's wet - the most likely conditions for a roof failure which results in water getting on to the membrane are freezing conditions resulting in ice damming or other such problems. Apart from anything else, TF200 is shiny which will improve the insulation qualities of the roof a bit.

 

But TF200 isn't certified for roofs. Any idea why?

[Thedreamer]

With the roof membrane is not when it's being fitted that when it gets wet and then freezes it causes a problem?

[Cpd]

Yes that’s correct but what would happen If you had a leak and water was tracking down the membrane and then froze, unbeknown to you, then after it thaws that section of membrane would not be waterproof and would then let water in next time it rained. It’s a bloody nuisance as I got caught out twice by freezing water ruining my membrane on the roof.  

[MikeSharp01]

Hmmm .. is there not a membrane that can cope with being wet & then frozen without loss of waterproofing? I must admit I had not come across this issue before so good to learn about it so I can avoid it.

 

 

[Cpd]

I think @Crofter may have used a good one, or @Russell griffiths has done the research if I remember correctly 

[ProDave]

I used Protekt VP400 plus on my roof, recommended by the builder as it would stand up to prolonged exposure before the roof got tiled.

[jamieled]

Ta to all who replied. A trip to the builders merchants on Monday is in order.

[Russell griffiths]

26 minutes ago, jamieled said:

Ta to all who replied. A trip to the builders merchants on Monday is in order.

This will be a waste of time as the staff in most bm won’t know a good product if it hit them around the face. 

[Russell griffiths]

I phoned SIGA and they sent a rep to my site, he was in a van filled with more fancy stuff than you could shake a stick at. 

He was very happy to demonstrate the sticking abilities of his tapes by applying them to our esp blocks and challenging me to pull them off. 

Not cheap, but do you want cheap, I would rather spend my money on good base materials than a wall hung toilet. 

 

My roof membrane has just cost me a little over £1500 plus vat, plus £120 in tape to seal the laps. I hope it was money well spent. 

[Patrick]

9 minutes ago, Russell griffiths said:

Not cheap, but do you want cheap, I would rather spend my money on good base materials than a wall hung toilet.

Give over. We all know you gonna have excellent base materials AND a wall hung toilet ?

 

To topic: SIGA=Worldclass materials

[dpmiller]

 

2 minutes ago, Patrick said:

Give over. We all know you gonna have excellent base materials AND a wall hung toilet ?

 

To topic: SIGA=Worldclass materials

 

Good to know. we're using some!

[jamieled]

@Russell griffiths how big is your roof?!

 

We're probably not aiming for the world class end of the market, just functional will do.

[Russell griffiths]

1 hour ago, jamieled said:

@Russell griffiths how big is your roof?!

 

We're probably not aiming for the world class end of the market, just functional will do.

355m 

[MikeSharp01]

 

12 hours ago, Russell griffiths said:

My roof membrane

Which did you choose and is it wet / freeze proof?

[Russell griffiths]

15 minutes ago, MikeSharp01 said:

 

Which did you choose and is it wet / freeze proof?

Mine is slightly different as we have a raised seam metal roof, so very different to your normal under tile type membrane. 

[jamieled]

2 hours ago, Russell griffiths said:

355m 

Sigh of relief from me as our roof is around half of that so my original cost estimate is ok. Cheers!