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10 Important Plastering Facts

09 December 2019

We all know of somebody who has endured the unfortunate experience of a ‘not so professional’ tradesperson.

This can be an unfortunate situation sometimes leaving customers having to pay double in order to fix a bad job. If you require plastering and are unsure of who to call (our team are of course on stand by) or what to ask, you can use some of our 10 important plastering facts to help.

How thick should plaster application be?

●    Wall Undercoats: 11mm thick
●    Ceiling Undercoats: 8mm thick
●    Finish Coats: 2mm thick
●    Walls Using Thistle Universal One Coat plaster: 13mm thick
●    Ceilings Using Thistle Universal One Coat plaster: 10mm thick
●     Thistle Magnetic Plaster: Minimum of 3mm

When sand and cement have been used as an undercoat, what’s the best plaster to use?

This purely depends on the suction level of the background surface. There is a choice of two plasters to use in this instance; Thistle Multi-Finish or Thistle Durafinish.

I’ve recently had a damp proof course carried out. What plaster should be used?

There’s some great information in the white book. Simply navigate to the plaster section and this will go into detail. That said, Thistle Dri-Coat is cement based and therefore ideal.

Does a wall have to be fully stripped of paint before it’s plastered?

If the existing paint is relatively strong and the condition workable, a wire brush and accompanying solution should work in removing any flakes. A ThistleBond-it prior with Thistle Multi-Finish provides great results. We suggest testing this out on a smaller area in the first instance.

Does plastering help maintain heat and air?

Yes, it absolutely does. When carried out correctly using Thistle plasters to plug gaps and cracks, walls and ceilings become airtight. This in turn keeps air inside rooms and buildings.  

Should damp walls be plastered directly?

This depends on the type of damp specifically. If you’re talking about rising or penetrating damp, plastering should be avoided until this issue is fixed. If however, the wall in question has recently had a damp proof course that’s worked well, plastering will be absolutely fine.  
Thistle Dri-Coat requires a single use and is very successful.

What if I notice salt contamination? What should I do?

If you notice salts when plaster is in the process of drying, seek the opinion of an expert who will remove these with due care and attention. If salt problems continue to happen this could be down to a more serious issue with damp.  

How can I plaster my walls and ceilings myself?

Don’t! Consult the experts!




 

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