Best roof membrane to use?

[jaythegorilla]

Hello

Joiner is due to build the frames of my 3 dormers on hip roof next week. He will make them temp. water tight with membrane, roofer was due to strip, re batten, re tile roof etc week after.

To cut a long story short, looks like i will have to attempt re roof myself.
So if anyone could suggest which type and make of roof membrane i should be laying i would be very grateful.

Many thanks in advance.

 

[BethesdaSlate]

Hello,
Most breather felts do not 'seal' around the nail as with traditional bituminous felts and consequently can be prone to letting water in under heavy prolonged rainfall, until the roof is slated/tiled.

However there are a couple of breather felts on the market that do seal around the nail giving much better waterproofing qualities if the roof needs to be left exposed for any period, these are also particularly good for using on boarded roofs.

The one I would recommend is 'Proctor Roofshield' which we have used many times, the extra expense has been well worth it.

Regards
Jon

 

[datarebal]

Or Klober Permo forte..Very Good.

 

[Regencyroofingipswich]

seconded - klober permo is excellent and reinforced..

Dont be tempted by budget breather membranes as they are like tissue paper, cromar vent 3 for example is awful.

 

[SASroofer]

Klober Permo Forte the best I reckon too. Make sure its the 'forte' and not 'eco-vent' though.

 

[DiscoDroid]

I know this is a 14+ year old thread but thought I'd come in with my very very limited experience. I'm just comming to the end of roofing a hip-to-gable conversion and read Regencyroofingipswich's message while doing my research.

I totally agree that Cromat Vent 3 and the cheap ones (e.g. screwfix standard stock ones) are just flimsy. Sure they are fine if you're a propper roofer, doing thigns quick and efficiently. But as a DIYer things took me so much longer with many weeks open to the elements, two yellow wind warnings and dozens of climbs up and down the battens. After I binned the Cromar, I got a roll or two of Tyvek Supro. Sure, they are much more expensive but they are a comparative joy to use, much thicker and robust. Didn't flap about in the wind nearly as much and really resistant to tears / rips.

 

[datarebal]

how do they perform under very heavy rain before the roof is completed?

We have used/tried most. always end up with the kpf

 

[DiscoDroid]

Can only comment on the Tyvek Supro. I had both pitches of the hip-to-gable exposed for a good few heavy down pours (6+ weeks) and it was pretty much impervious. Really impressive. The only bits that obviously let water by were the batten fixing holes.