Window airtightness options

[Moonshine]

My windows are going to be finally fitted in a couple of weeks, and my mind is going how to make them air tight. Currently the openings look like this.

 

 

My initial thoughts were to use ME508 200mm fixed to the frames before they go in. The window installer has agreed to fix the membrane to the frame as he installs, but is leaving the rest of the airtightness work to others.

Having looked at the cost of ME508 (£88 exc vat for 25m i am wondering if there is a more cost effective way.

 

https://www.sealantsonline.co.uk/Products/illbruck-me508-duo-membrane-ew-f/TRE5301

 

What about installing the windows as is and applying a tape like tescon vana 60mm the joint

 

https://www.ecologicalbuildingsystems.com/product/tescon-vana

 

The tape will be more labour intensive but would be a third of the cost.

 

Any other solutions i have missed or even using a 140mm wide ME508

[crispy_wafer]

I've just started internally taping up my Window and door openings with Isocell Airstop flex tape which is a bit cheaper...

[Peter M]

Whatever you do don't use the Obex product which is a rubberised product as our plasterer said that he can't put plaster onto it either as a dot and dab or wet plaster as it won't adhere very well. Our window installer used the Obex type which we are now insisting that is removed and replaced with illbruck me508 with a full adhesive backing. 

[craig]

I personally recommend ME508 airtightness tape 150mm or 200mm, alternatively TP654 which is a 3-1 product is basically Compriband/PU foam with airtight layer interwoven.

 

Little bit more expensive but worth the money.