Weber Render multiple cracks

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Brian44

New Member
Hi Everyone. I have white Weber Render on my house which is 51/2 years old. The back of the house has a few cracks and some blown render. The side and front has larger cracks. One is 8ft down, moves across a foot, then down another 7 ft making it 18ft long in total. The back is full of Algae, all around the full base of the house the DPC course was wrong, the render is cracking and crumbling away. What fix would this require? Should a structural surveyor check it out for subsidence?
 

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Rigsby

TPF Special Forces
They are mostly stress cracks. The only thing the renderer may not have done is create an expansion gap where the render goes up to the window sill.

The algae in the pic1 is water splash back off the decking. Looks like you have a leak where the pipe bracket is. The algae under the coping is water running off the joints. The coping could do with a built in drip with a drip in the joint cement to match.

Apart from the possibility of no expansion at the sill I can't see the render being at fault. Poor design in water drip off.
 

Brian44

New Member
The water at the top was the coping stones failing, water running through the porous joints. Its been rectified. The pipe bracket was not a leak, crap from the roof ran down the back of the pipe hitting the brackets and spreading out. The boxes at top of pipe were not connected to roof.
The Agae was caused by the decking, paving and garden levels all above or level with the DPC course.
This is being sorted.

What about the render that has blown? There are multiple cracks, mainly at windows or doors but the 18 ft crack is not.

What would be a recommended repair?
 

Brian44

New Member
Forgot to ask, are expansion joints meant to run from corner of doors and windows with these being the weakest points?
 

Brian44

New Member
There are a few companies around that do repairs, I was hoping someone could advise on what a repair like this should entail.
 

owls

Private Member
You can use a fine resin that fills the cracks out with, then put a coloured stabiliser over the top, it requires the full panel doing as a localised repair will stand out.
I dare say the expansion bead above an opening is doing nothing, as it will just be a day break for the Renderer,there would be a concrete lintel above an opening, they won’t have cut through it, for obvious reasons.if it doesn’t go through the skin of blockwork it’s doing nothing.
 

johnzo

Active Member
Notice how there's no photos of the house before it was re plastered,thoses cracks didn't appear over night ,you can see clearly in one photo the cracks are following the block joint.the damp up top is clearly coming off the joints of the caps more than likely the drip channel is filled in a lot of time in theses jobs u have to work to what's there ,I have seen countless chimneys re plastered with the same problem to give it a sufficient coat you have to cover the drip channel,u get yea it will be fine I'm not removing the cap then when done why does it look damp .onevof your down pipes is leaking,I think u had it replastered to hid a lot of problems then when they come through u want to point the finger
 

Brian44

New Member
Hi all.
I’m still waiting on work to commence on my render from the developer. They are going to lower the decking levels first to meet DPC regulations as the levels are higher than the DPC.

I’m wanting to ask.
Why is the render on the whole back of my house full of black and green streaks, literally it’s covered.
Is it because the dampness has risen all the way up and down?
The back of the house gets the Sun from Sunrise till later in the afternoon, so it’s not shaded.
The front of the house gets less Sun but has none of these damp issues.

Do you think this render is damaged beyond repair? It’s all crumbling at grind level.
 

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Brian44

New Member
It grows over time. Heat from inside can do it too. It’s very porous so just stop the water penetrating. Get it washed and you could apply the sealer yourself.

The developer is going to repair and paint it. I told them it all has to be cleaned first to get rid of algae, otherwise it will come through the paint. I’ll need to tell them it needs sealing too once painted. I’ll await the schedule of works to see what it says.
 

Rossi46

Private Member
The developer is going to repair and paint it. I told them it all has to be cleaned first to get rid of algae, otherwise it will come through the paint. I’ll need to tell them it needs sealing too once painted. I’ll await the schedule of works to see what it says.
A masonry paint will seal it. Not sure you could paint over a sealer
 

Brian44

New Member
I meant once painted should it then be sealed with something or as you say, the paint should create a seal.
 
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