Water penetration to dwelling

lennie6998

Hope someone can help me with this as my head is wrecked at this stage. My house was constructed in 2006/2007. Standard 300mm cavity wall with foil back insulation in the cavity. We are having a problem with the ingress of water at the gable where the sunroom is attached.

This has happened from the start and a window in the gable was removed early on by the builder. However part of the problem is that the sunroom is at the opposite to the prevailing wind and this only occurs maybe once or twice a year (too often). We have had roofers out to look at the flashing on the roof of the sunroom and make repairs only for the same thing to occur again maybe months later.

When the house was built a cavity tray was not fitted in the gable and i'm starting to think that the water, which generally shows up in high winds, is coming in through the block in the cavity and showing up in the corner of the sunroom. What can I do now to prevent this. I'm even thinking of external wall insulation as a way of preventing this, but that would be expensive and a last resort.

Is there any other coating which could be applied to the external wall to provide an impervious barrier. Anyone with any similar experience of this
Thanks
Lennie

mickdw

Your problem is absolutely 100 percent the missing cavity trays over conservatory roof.
There are a few options to cure this but any permanent ones will involve a bit of work.
I wouldnt go for any of the paint on sealers as they will at best be a stop gap and at worst not work at all.
Did you mean the window was closed up or was removed and replaced?
What part of the country are you in.
I would be pretty experienced in this issue being an Engineer certifying houses in the west.
I've been called out to more than a few houses completed by others where this issue needed sorting.
The outer block wall overhead is entitled to be wet through. In your case, that wet wall is continuous down into your conservatory given that there are no trays to cut off flow of moisture / water.
Even in cases where the trays are installed, a huge number of blocklayers forget to maintain the cavity gap right up to underside of trays - hard to explain but that also has the effect of water being drawn across into the internal at the eaves level. There is a bit of work involved in all these problems.

lennie6998

The window on the gable was taken out and refitted with new DPC trays. I'm in Donegal. What is the solution to this problem and is it expensive?

mickdw

lennie6998 wrote: »

The window on the gable was taken out and refitted with new DPC trays. I'm in Donegal. What is the solution to this problem and is it expensive?

PM Sent.