Plastering F.A.Q



 


I'm not sure about plastering?

That's fine. Just drop us a line and we will give you honest, friendly advice.



Is plastering messy? 

There is a little dust from the plaster but It's not that messy, we make every effort to ensure a clean job.

All surfaces, walls, windows and doors will be cleaned before completion.

Any fixtures and fitting that are removed for plastering, will be refitted.



What are the different types of plastering?

Plaster Skim / Reskim

Plaster skimming is an internal finishing coat of plaster to provide a decorative finish to internal walls and ceilings, it is smooth to the touch and may be painted, wall papered or tiled. Finishing plaster can be used over many different types of backgrounds such as plasterboard , sand & cement , backing plasters or old existing plastered walls and ceilings (reskim).

Floating

This is a technique for applying a backing plaster or undercoat plaster to smooth out uneven walls and fill in holes. A backing plaster will be needed if walls are in poor condition, if the existing plaster is loose and need to be removed or if the walls are back to brick/blockwork. There is a variety backing plasters depending on the background suction*

* suction it the amount of moisture that is absorbed by the background wall.

Direct Bond Plasterboard (Dot & Dab)

This Method of plasterboarding is usually used on new buildings or extensions but can also be use on damaged walls such as fireplaces. Dabs of plasterboard adhesive are applied to a wall on to which plasterboard is then put. When dry this method has an extremely strong bond to the wall.

Plasterboarding Mechanical fix

Plasterboard fixed to metal or timber stud work with screws. Damaged ceilings may be overboarded with new plasterboard and fixed though the existing ceiling into the ceiling joists.


Can you cover my old Artex?

If the depth of the pattern is shallow it may be possible to plaster skim directly on top. If the pattern is deep or the wall / ceiling is damaged or cracked plasterboarding or floating with backing plaster first may be needed before the plaster skim finish.


After removing my bathroom tiles the plaster came off with them!

The walls will need 'floating' with a backing plaster and then a plaster skim.



Can you plaster onto any wall or ceiling?

The background is the most important part of plastering and it is not always possible to just skim over any wall or ceiling. Skim plaster should only be applied to a thickness of around 2-4mm.

Walls that are back to brick, in very poor condition or heavy Artex may need plasterboarding or floating with backing plaster first.

Ceilings that have many cracks or are too badly damaged may need overboarding with plasterboard before a plaster skim finish.


I have lots of cracks will a reskim cure them?

A plaster reskim is a  very thin skin and should be thought of as decoration rather than structural. 

If the cracks are deep and caused by movement, just reskimming will not cure them, the cause of the movement must be addressed first.

If the cracks are surface or hairline then a glass fibre scrim tape is applied before reskimming. This reinforces the crack and 'reduces' the chance of the cracks reappearing.

Common causes of cracks

                         Symptoms                            Solution
 Ceilings  
  Crack and movement due to water damage    Damaged area removed and made good
  Crack and movement due to impact from above Damaged area removed and made good
  Old ceiling crack ( +25 years) Remove and re-board or overboard with new  plasterboard and skim finish.
  New ceiling crack (-25 years) Scrim tape may be used to reinforce the  cracks and 'reduce' the chances of  reappearing, there must be no movement  when  the ceiling  pushed up.
  Cracks in Artex  Remove and re-board or overboard with new  plasterboard and skim finish.
   
  Movement on one side of crack May be screwed up then scrim tape used to  reinforce the crack and 'reduce' the chances  of reappearing, there must be no movement  when  the ceiling  pushed up.
 - Preferred method is to overboard with new  plasterboard and skim finish.
  Movement on both sides of crack Remove and re-board or overboard with new  plasterboard and skim finish.
  Large area of movement On ground floor ceilings check for movement  by having someone jump up and down in the  room above, if there is to much bounce the  joists may need reinforcing. 
   
   
 Walls  
  Cracks around windows and doors         These are the usual stress points especally  in newer houses, the cause must be  addressed first.
  Around where a door has been blocked up  using timber and plasterboard. Cracks may appear when timber stud work  meets existing brickwork especially if  impacted.
     -Tape and skim (may recur if impacted).
 or - Dot&Dab plasterboard to both sides.      
      (whole wall)
 or - Remove timber stud and brick up opening.
  Plaster on timber Plaster will always crack on timber and should  be covered will plasterboard first.
  Larger cracks on older walls (+25 years) Loose or blown plaster maybe due to  subsidence will have to be removed and then  made good.
 On lath and plaster walls that are badly  cracked may need to be removed down to the  timbers and reboarded with new plasterboard.
  Larger cracks on newer walls (-25 years)     Usually down to loose plasterboard or  movement in the walls.
  Hairline cracks on older flat walls Scrim tape may be used to reinforce the  cracks  to 'reduce' the chances of  reappearing.
   


Do I need to remove furniture?

If possible please clear as much furniture from the intended areas of work.




Will I need to remove carpets?

Not necessarily, carpet and laminate floors in the areas of work will be protected with high quality plastic floor protection.



How long does it take for plaster to dry before decorating?

Drying times vary depending on the background and time of year. A small window should be left open so that moisture drawn from the walls can escape.

Plastering on to plasterboard will dry much quicker (about 2-3 days) than on to backing plaster (about 4-6 days). As a rule plaster should be left for about a week before painting or tiling.




Painting new plaster

The first coat of paint applied to new plaster is known as a mist coat and is usually a cheaper white or magnolia matt emulsion diluted* with water.

*3 parts emulsion – 1 part water

Apply with roller to an even coat, flattening any lines made by the roller edges. Do not worry to much that you can see though this coat and looks patchy.

The mist coat being diluted paint gets drawn into the wall and seals it. If you use an undiluted paint the moisture would get drawn out to quickly, and the paint would sit on top of the plaster rather than become part of the plaster.

When dry (usually about an hour) this is followed by two top coats(undiluted) of your chosen colour quality paint.



How long does it take to plaster a room?

Most rooms can be completed in 1-2 days.





What sort of materials do you use?

We use only the best quality materials, not only the plaster but preparation materials too.



What time do you start?
Job start times are usually 8:00am