My son has a lean-to conservatory across the back of his mid-terraced house. In February 2007 the whole roof had to be replaced due to storm damage (insurance paid ). Later that year the house walls were cavity insulated; although at the back they were only able to do the part above the conservatory.

Last winter, water started to appear on the back wall of the house. It seemed to be coming from the main cross member tying the roof to the house. The installer came (10 year warranty) and diagnosed it as a failure of the seal, which was repaired using a sealant gun.

The same problem has arisen again in this very wet weather (the conservatory faces due south). The installers came along last week and this time said the problem is due to failure of the pointing. They said they had filled some of the worst holes with sealant, but the back wall really needed re-pointing.

I would have thought that any water permeating the bricks would creep down through the cavity insulation (which stops about where the roof joins the back wall) and then drop down the cavity to the damp-proof course. There is no sign of any water at that level or of any water leaching out of the wall. It all seems to come from the main cross member tying the roof to the house.

Does any of this make sense? Is it a pointing problem or a conservatory roof problem?

Is the water inside or out.

Some pics would help Dave.

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It's on what was the outside wall of the house.

Here's a quick sketch, pics to follow.

Almost certainly a flashing issue in that case.

Is it possible that driving rain can get under the lead, a hose pipe directed in that area may show.

How much up-stand is there, as you don't show any.

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what you need to remember is the pointing over the years become porouse then it gets repointed or at least the front layer does so if the front layer goes again the water can perculate down between the bricks as well as down the cavity

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Excuse my ignorance; what's "up-stand"?

There should be 150mm ish of lead on the roof, and then turned up the wall 80-100mm and be chased into a brick course.
_
\__. like that if it works

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when you look at the lead, it should have a bend where the roof meets the wall.

The upstand is the distance up the wall above the roofline the lead reaches.

Here are some pics. Doesn't look too "professional" when you are close up!

I would say the sheets are leaking.

Can you direct a hose up the roof sheets to the top edge, without splashing over the mullions.

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We'll give it a go over the weekend.

Hi D,

Also, the vertical joint in the lead flashing doesn't look too good, driving rain could force itself behind the flashing and drip down anywhere.

If that was my job, I would condem the silicon, get them back to do it nicely, doesn't matter that your can't really see it from the ground, looks shoddy and unprofessional.

S

......also, the lead is not dressed down very well over the horizontal plastic, driving rain could get under there too, also, it looks a bit short to me, should have been a wider piece of lead, i would definately get them back.

The pointing needs some attention too!

S

If it was getting in through the pointing, the water would show on the wall below, the water is getting in around the edge of the sheets or mullions somehow.

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Possibly the rubber gaskits have failed or are incorrectly seated?

S