Tryolean poor finish and damp patches

Question

Just had a gable end wall rendered with tyrolean leaving a very lumpy uneven finish with outlines of the blockwork showing through (ghosting I believe its called) . The original render was hacked off, then a very thin coat of a grey material was sprayed on to the blockwork before they started spraying on the tryolean, they also did not removed a wood burner flue just sprayed around existing render. Now after rainfall not only do we have the uneven finish but the area around the flue looks damp for days. Builder has offered to recover the wall due to poor finish but I am worried job was not done correctly in the first place -  should there have been some form of render applied after the thin grey substance and before the tyrolean?

James · Accepted Answer

The grey thin coat material sounds like a cement grout which you can do for preparation before a scratch coat which should be applied onto the cement grout whilst this is still tacky to the touch.
Then the next day a straightening/float coat of render should be applied, leaving it to firm up then the Tyrolean finish goes on leaving a flatter and more uniform finish. This is the way in which I do this type of job.

Craig · Answer

You should have had a coat of sbr/cement slurry painted on followed by a minimum of 10mm basecoat/ scratch coat then a flat coat of around 10mm then tyrolean applied all with a waterproofing additive mixed into the cement.

Lee · Answer

It may be that the base coat is too thin and the finish has been applied by an unskilled or inexperienced renderer.

Anthony · Answer

It should have been covered with 15 mm of render consisting of two coats. One scratch coat and a second coat to adhere to that.  This ensures no brickwork is showing with the correct membrane. Tyrolean is then applied when render is cured dry.

Mak · Answer

Hiya, after brick work was exposed a scratch coat should of been evenly distributed left to dry then the tyrolean, I also would of use an SBR coat over and direct to block work as this helps form a weather-resistant barrier plus it helps reduce the porous blockwork drying out your scratch coat too soon. 
On the other hand with dealing with the current builder, I'll assume he's got kids to feed and a family to take care of just as I do, I'd request that he can talk you through each stage and ask him to prove he's confident and can guarantee the best results.  I'd like to think he's honorable and is keen on rebuilding his reputation.

Kalin · Answer

Yes Tyrolean is a textured finish for rendered surfaces if the brickwork is ghosting through then the background is too thin

Sean · Answer

Sounds like the Tyrolean is too thin and needs more material.

Gino · Answer

Possibly the first coat should have been thicker providing a good base coat 
Allowing him to rectify the problem is advised but ask for photos of works in stages. If the money owed (doubtful) to them hold until satisfied see if any guarantee on works or product is included

Tryolean poor finish and damp patches

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