Wet window sills/cills/reveals

[Jimbo37]

Oh dear, Im worried - please put my mind at ease

I have a 'regular' block and s&c render house, with a flat roof in the final stages of build. I finally had the windows sealed (rubber between frame and glass and the mastic between the s&c and frame) a few days ago. Todays rain has shown a problem on 14 of the 18 door/window openings - a wet patch at the bottom of the inner reveal (always on one side, just) - see pic. (There is S&C behind the cladding).

I have noticed this previously, but the builder felt it was because the rubber on the windows was missing - obvs, Ill speak with him in the morning. What is most likely to be going on?

Edited January 21, 2024 by Jimbo37

[twice round the block]

With that amount of hard landscaping around the building the rain must be bouncing off it and and going above any dpc level you have.

In your photo it shows a damp patch at ground level on the righthand side of the building.

I'm concerned there is no gap around the building to act as a soakaway for any rain water. It's not normal to pave upto a building. A 200mm minimum gap is normally let and this is filled with pea shingle to aid water runoff.

Is there a renderstop on the bottom edge of the render.?

[markc]

I agree with @twice round the block I can’t see any weather/water break between the paving and the building. Any water can be blown up the slope and directly against the build/render. Not even a break at the door

[Andehh]

Have you got any pics of before installation? Or during construction?

 

 

[ETC]

DPCs not placed correctly at the jambs. Open up a jamb and see how the DPCs have been placed.

[Andehh]

As has been said, use this storm to inspect how damp the walls get. Generally you get it rendered down to 2 engineered blocks, which is where DPC is.

 

I'd be tempted to use this storm and the damp near ground level to get the render trimmed back up.

 

Not a great pic, but you can see where my dpc as the render stops, I have raised beds/driveway etc to go in yet!

Edited January 21, 2024 by Andehh

[markc]

Just read the title - didn’t see the sills, cills and reveals bit… *read the question before answering* and stop just looking at the pictures 🙈

Edited January 21, 2024 by markc

[Jimbo37]

  On 21/01/2024 at 17:38, twice round the block said:

With that amount of hard landscaping around the building the rain must be bouncing off it and and going above any dpc level you have.

In your photo it shows a damp patch at ground level on the righthand side of the building.

I'm concerned there is no gap around the building to act as a soakaway for any rain water. It's not normal to pave upto a building. A 200mm minimum gap is normally let and this is filled with pea shingle to aid water runoff.

Is there a renderstop on the bottom edge of the render.?

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There is a 50mm runoff on patio, does that deal with issue soakaway would deal with?

No render stop.

The patch you see is a problem with paint, as it rained before it dried

[Jimbo37]

  On 21/01/2024 at 18:21, Andehh said:

Have you got any pics of before installation? Or during construction?

 

 

Expand  

Not great pic, but shows some detail. I'll look for more

Edited January 21, 2024 by Jimbo37

[Jimbo37]

  On 21/01/2024 at 18:26, ETC said:

DPCs not placed correctly at the jambs. Open up a jamb and see how the DPCs have been placed.

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I'll look for pics, but it looked right. Step dpc in head, and strip of dpc from inner leaf down outer leg of frames

Edit: see 1 pic up. Unfortunately I don't have much better pic

Edited January 21, 2024 by Jimbo37

[Jimbo37]

Ive spent a bit of time studying these today

1 - I noticed that there are weep hole covers missing, could that be the source?

2 - I see cills run under frame from outside to inside, could water be getting blown back through?

3 - Mastic is good, but not perfect everywhere (could this be the cause, or is this really essential to weather proofing)

 

[Jimbo37]

@Andehh see pics above, and this one which was taken for unrelated issue (unprotected timbers) but shows head stepped dpc