Roof membrane overhang into gutters normal?

Hoorah

Hi all,


Just having a new conservatory built with a tiled roof. My question is relating to the membrane under the tiles. It overhangs and is on show, to the point where I can see it flapping in the wind. I asked the builder about this and it said its to stop wind getting into the roof?? I'm clueless but it just doesn't look right to me. I've uploaded some pictures of it.


Please see them here,


I don't want to make the final payment without knowing its OK. Any help appreciated!

EDIT: struggling to post links to pictures as im a new member, please copy the below links.
ibb.co/Rb1HBfG
ibb.co/DwsjY8k
ibb.co/8gJRRNQ

Davesnave

https://ibb.co/Rb1HBfG
https://ibb.co/DwsjY8k
https://ibb.co/8gJRRNQ


You can easily cut the membrane to suit, as it is too far into the gutter.



It's the part where the two roofs meet that looks of more interest to me. I've not seen an arrangement like that before, but I should wait till some real builders look and give their 2p worth!

Grenage

That is indeed an interesting 'join'.

JimmyChanga

I'm not a roofer but that certainly doesn't look right where it's meeting the existing roof. How s the water draining from the original where it meets?
Or has he stuck that membrane in just to do that! I've got a feeling he has.

Hoorah

Cheers, when we originally had it quoted, he said he would create a "box gutter" where the garage roof meets the conservatory. I haven't actually been on the garage roof for a closer look yet due to the poor weather. However here are a few photos

ibb.co/nBNsnmH
ibb.co/ZMh9Mp6



From reaching around with my hand, it feels as though there is a hard felt being used in that gap and not plastic guttering. In fairness its been up a week and there have not been any leaks in the garage or newly built conservatory and its been raining everyday.

Aylesbury_Duck

Never mind the felt, that roof "join" is not good.

stuart45

Davesnave wrote: »

. I've not seen an arrangement like that before,

Make the most of it ,you might not see it ever again.

tacpot12

It is normal to drape the roofing membrane into the gutter. This necessary to allow any water under the tiles to drain down into the gutter. The water is condensation, not rainwater. It's nothing to do with wind under the roof. You want ventilation under the roof.

However, the membrane is usually cut so that is just reaches to the bottom of the gutter, and the gutter is at the level of the roof so is rarely visible. The biggest problem you seem to have though is that the gutter is much lower than the edge of the tiles. On the original roof (to the left), the drop from the edge of the tiles to the gutters is about 10mm, which is ok. On the new roof, it is about 40mm. The gutter needs to be moved up. It looks like the builder has been lazy and not reworked the guttering correctly.

Hoorah

If the membrane is sat within the bottom of the gutter, could it cause rising damp up through the membrane under the tiles?



In regards to the gutter being too low under the tiles, what issues would this cause? It's been up a week and we've had heavy rain, I've not noticed the rain running past the gutter and it all seems to flow ok. My main house rear gutter runs onto the top of the conservatory roof as per the photo so there's alot of water running onto it.



Also in regards to everyone's comments about the roof join into the garage roof. What issues will this cause exactly?





From everyone's opinion, is this roof a real issue here and would they reject it?



Please forgive what may be stupid questions! I just need to at least sound like I know what I'm talking about when he comes around. :rotfl:

ian103

The junction detail is very poor, in fact Id question if it is weatherproof. I would get them back and get it sorted properly.

It should be valley gutter type detail, the tray can be grp, plastic. aluminium, lead etc.


An example is:-



https://www.marley.co.uk/products/accessories/grp-dry-valley

stuart45

We use eaves protectors nowadays. Running the felt or membrane into the gutter means that the sunlight wrecks the felt. You see it all the time at the eaves.