A year ago I converted a house into 3 flats. The ground floor windows were totally replaced with new upvc. 2 windows were fitted into existing sized gaps and 1 resized larger to match a previously smaller window space.
There is now substantial damp on internal plasterboard reveal of resized window although the others are experiencing it too but to a lesser degree. Initially thought it was condensation and it might be a little bit but there's too much for it to be totally that.
Being in cumbria, a huge amount of rain in the past few months has meant water is getting in somewhere. As this project was done to building regs we had to thermally insulate the external wall and did so except above the windows as there was no space to fit thermal board between wall and windowframe so it is single layer of fireboard not helping if cold bridging is happening on top of there being a leak.
There are 4 concrete lintels above the upvc window and I suspect water is coming in there
similar to the guy in this thread
//www.diynot.com/forums/viewtopic.php?p=1137238
My question is
1. should the builder have put some sort of a dpc layer /dpc tray around/above the window?
2. Are the drip beads sufficient?
3. Does anyone have an image of what a dpc layer installed above a window should look like. I have googled and trawled through diynot but only found stuff for cavity walls but not solid walls which these are.
Below are images of the damp inside and the outside of the building - you can clearly see the area's that have been remortared around the resized window. I assume the black line between flats is a DPC and interesting next door have something different going on between levels.
I suspect he maybe also forgot to waterproof in the mortar when re-rendering. He's now not in business so need to instruct a new builder to redo.
4. What should be the correct process of going about fixing this?
Any advice would be really helpful as to where to start. Thank you in advance
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There is now substantial damp on internal plasterboard reveal of resized window although the others are experiencing it too but to a lesser degree. Initially thought it was condensation and it might be a little bit but there's too much for it to be totally that.
Being in cumbria, a huge amount of rain in the past few months has meant water is getting in somewhere. As this project was done to building regs we had to thermally insulate the external wall and did so except above the windows as there was no space to fit thermal board between wall and windowframe so it is single layer of fireboard not helping if cold bridging is happening on top of there being a leak.
There are 4 concrete lintels above the upvc window and I suspect water is coming in there
similar to the guy in this thread
//www.diynot.com/forums/viewtopic.php?p=1137238
My question is
1. should the builder have put some sort of a dpc layer /dpc tray around/above the window?
2. Are the drip beads sufficient?
3. Does anyone have an image of what a dpc layer installed above a window should look like. I have googled and trawled through diynot but only found stuff for cavity walls but not solid walls which these are.
Below are images of the damp inside and the outside of the building - you can clearly see the area's that have been remortared around the resized window. I assume the black line between flats is a DPC and interesting next door have something different going on between levels.
I suspect he maybe also forgot to waterproof in the mortar when re-rendering. He's now not in business so need to instruct a new builder to redo.
4. What should be the correct process of going about fixing this?
Any advice would be really helpful as to where to start. Thank you in advance
