Roughcasting problem

gclementsjoinery · 19 Oct 2009

Hi there,

Below is a photo of roughcast at a client's house. Roughcasting isnt something that I have done before , though I would like to be able to since the opportunity has arisen.

Untitled

gclementsjoinery
19 Oct 2009
1

The roughcast is loose/boss around 350mm upward from ground level and is in this state , past the dpc.

I am first of all wondering why this has happened, but imagine it is due to water/dampness/frost getting in over the years.

Secondly , I am not confident about getting a match to the exisiting roughcast, and the client does not wish to roughcast the whole wall.

Is there anything you can suggest ?

Thanks in advance,
Gregor

JohnCo · 19 Oct 2009

Roughcast to me is a render the has shingle thrown on to it when it is still wet. Some cover the stone with cement wash before hand. To match the exhisting, you must pick the same size and shape of stone.
Of more importance in your situation is finding out why there is a wet patch at that point (possibly leaking overflow/gutter?), plus you must expose the DPC to stop ground water crossing it!! Regards JohnC.

gclementsjoinery · 19 Oct 2009

There are no leaks in the gutters , however the roughcast does cover the dpc.

JohnCo · 19 Oct 2009

You can cut the roughcast just above and below the DPC, but the best way is to cut 4" or so above and render on a `bell cast `bead to just cover the join from the eye. Regards JohnC.

gclementsjoinery · 19 Oct 2009

I see, so what would you suggest to rectify this problem , without having to re-do the whole wall ?

Alastairreid · 19 Oct 2009

strip the cast and fit a bellcast bead at dpc level then smooth render below the bead and recast above.

what type of floor is in the property?......i dont see any vents!......is their any dampness showing inside?

JohnCo · 19 Oct 2009

If you tap the wall the sound will tell you if the render has lifted - use an angle grinder to cut above the loose area. This will stop the area getting bigger when you knock it off. Regards JohnC.

gclementsjoinery · 19 Oct 2009

I had actually suggested the smooth render idea to the client , but I would still have to try and blend the bellcast in wouldnt I ?

The roughcast is loose up to where the pipe goes into the wall (not the overflow) , however you can see by the change in colour for the length of the wall that the rest may also become loose.

Alastairreid · 19 Oct 2009

you wont get a seamless joint in the roughcast, and the new run of cast along the bead will stick out like a sore thumb.

gclementsjoinery · 19 Oct 2009

Yep , this is what I feared

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Roughcasting problem

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