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You should put PVA on, but you cannot tile onto hardwall. It will need to be gone over with multifinish and then allowed to dry. A tiling sealer (not PVA) should then be applied prior to fixing tiles.
Do you need to PVA before bonding plaster?
Do you need to PVA before skimming? Preparing a wall for re plastering requires a dilution of around 3 parts water to 1 part PVA glue. PVA glue can be applied immediately before the skim coat is applied having allowed the PVA glue dilution to have become tacky before plastering.
Do you PVA bonding plaster?
Yep just like any other backing plaster and certainly no need to PVA unless its been on a good while and then you can just wet it.
What is the difference between Hardwall and multi finish?
Hardwall Plaster: Hardwall is similar to Browning except that it offers a higher impact resistance and quicker drying surface. Multi-Finish Plaster: Thistle multifinish is a top coat plaster which is suitable for a great finish on all the other surfaces.
How thick should bonding plaster be?
How thick should a bonding coat be? Floating coats should be applied at a thickness of 8mm, up to a total plaster thickness of 25mm, and wire- scratched between each coat. The final floating coat should be ruled to an even surface and lightly scratched to form a key for Thistle Multi-Finish.
How thick can you put Hardwall on?
When a substantial area is covered, Thistle Hardwall is worked and ruled as in hand plastering. It is easier to attain the required thickness of plaster in one application by machine, but the total thickness should not normally exceed 25mm (subject to background suitability).
Can I dot and dab onto a plastered wall?
Correct, you’ll fine the moisture in the plaster when you dot & dab will loosen the old plaster.
What’s the difference between plastering and skimming?
Skimming is the name given to a plastering technique where a wall is plastered with a layer of thin coat. It is usually applied to an existing plaster to smooth the surface. Another difference between skim and plaster is that plaster surfaces are always rough whereas a skimmed surface is smooth.
Does PVA go off?
The recommended shelf life on PVA glue is generally a way for the company to cover its butt. One year is simply the length of time they will guarantee the quality level. But most glues can go for two years or more if stored consistently at room temp.
Should you PVA before dot and dab?
I would dilute pva with water, about 4-1 and roller it on as its quicker, when dry it will be hard and wont be sandy at all. Ideal for dot and dab.
How thick should DAB and dot be?
When calculating how much dot and dab adhesive you’ll need, remember that dabs should be between 50mm and 75mm wide, around 250mm long (the length of a trowel), and about 10mm thick. You’ll need three vertical rows for each board, placing each dab 6 to 8 inches below the last one.
What is the difference between bonding and Hardwall?
bonding is a undercoat plaster for low suction background like concrete. hardwall has high impact resistance and is quicker drying.
Is UniBond the same as PVA?
PVA is PVA as in its the same chemical compound, what varies is the concentrate of it.. UniBond can be diluted more than Wickes own brand etc/ but you obviously pay for it.
Can you tile straight onto Hardwall?
If you are part tiling a wall of hardwall, you are obviously better to skim it all. If you want a surface to tile, sand and cement is the one, but any sound skimmed surface will do you. You can tile onto hardwall and it will last, and you can get hardwall closed in good enough with fat to help the tiler.
Can you tile over multi finish?
At least its new plaster so if it’s been applied correctly, then it’s unlikely to delaminate. Make sure it’s dried out well, couple of coats of primer then off you go. You’ll need flexible tile adhesive (bagged) for porcelain.
How long does HardWall take to dry?
How long does it take bonding to dry? Bonding about 2-3 hours, but some do leave it to following day before skimming depends on size of area. The 3-4 days is a guide, the colour of the plaster will tell you when it’s dry enough to paint.
Is SBR better than PVA?
One key difference is that, whereas PVA remains water soluble after drying, once dry SBR is not. Consequently, the SBR bonding agent is more suitable for situations where damp might be a factor, such as external finishes, shower areas and swimming pools, as well as in sand or cement screeds and renders.
Can you plaster straight onto Hardwall?
You can plaster directly over hardwall the day after. As Wine~o said, pva either day before or prior to skimming. Try not to over saturate the hardwall as it will blister. Blue Grit will give a much longer workable time.
How much does a bag of Hardwall coverage?
Thistle HardWall
| Order Code | Nominal bag weight (kg) | Approx coverage (m²) |
|---|---|---|
| 06110/3 | 25 | 3.0 |
Why do plasterers use PVA?
PVA for Bonding Adding a coat of the glue to your wall surface just before you start plastering helps to bond the plaster to the wall. The PVA literally helps to stick the plaster in place in the same way it can bond two pieces of wood together.
Is it better to dot and dab or Batten?
Re: dot and dab or battens Far better for hanging units onto than dot and dab. First layer of boarding done with 12mm ply and second layer 12.5mm plasterboard. Gives you fixing position at any point you wish to use on the wall. far superior way to go about the job, for quickness, ease, insulation, etc etc.
How long do you leave PVA before bonding?
Clamping is required for 30 minutes to 1 hour to set the glue; curing time is 18 to 24 hours. School glue, a type of white glue, dries more slowly. Inexpensive and nonflammable, PVA glue dries clear.
How long after PVA can I plaster?
For high suction, seal up at least 24 hours before . PVA not much good on a high suciton background unless it has well set, usually even a few coats the same day not good enough. Then, of course, apply plaster to a tacky fresh coat of diluted PVA.
