How To Deal With This Wall Crack?

Mr Sparkle · 19 Jun 2019

What's the correct way to deal with cracking along the perimeter of a room before decoration?

The cracks are located at the abutment between the ceiling and the wall.

Thanks

blup · 19 Jun 2019

A flexible filler like toupret fibacryl is widely used for cracks up to 1 cm, which are then overpainted. But further movement can always reopen cracks particularly from a first floor room that is walked on.

http://www.toupret.co.uk/business-customers/products/specialist-solutions/fibacryl-FIBACP01G.html

Blup

opps · 19 Jun 2019

I'd sand away any rough edges to begin with. I'd then use a MS polymer such as Sikaflex or CT1. They are like silicone sealants but can be overpainted.

Standard caulk may, or may not crack. Either way, caulk will shrink back, potentially leaving you able to see where the crack is/was.

Try to make sure that the concave section isn't too big when you apply/smooth the MS polymer, otherwise cutting in will be more difficult. It is always easier to cut in when you have a true right angle.

Use decorators' wipes to clean up afterwards. The sealant are very sticky.

opps · 19 Jun 2019

blup said:
A flexible filler like toupret fibacryl is widely used for cracks up to 1 cm, which are then overpainted. But further movement can always reopen cracks particularly from a first floor room that is walked on.

http://www.toupret.co.uk/business-customers/products/specialist-solutions/fibacryl-FIBACP01G.html

Blup

Fibacryl is great stuff but difficult to smooth off cleanly. Additionally, like other caulks, it will shrink back.

Although I too recommend it, I recently had to visit a house with crack in the suspended ceiling plasterboard join. Unfortunately the electrician fitted two recessed lights bang on the join. I didn't want to cut through the plasterer's tape and so simply dug through the top layer of skim and then applied the Fibacryl and then filled over the top of that.

It cracked again within two days. I guess that the crack wasn't deep enough for the fibacryl to work properly. The fact that I didn't allow it to cure fully before over filling didn't help either. I now have to go back and do an Easy Fill tape and fill...

Mr Sparkle · 20 Jun 2019

Thanks for the input guys.. Your comments were very helpful

ic1927 · 20 Jun 2019

Fibacryl isn't that good, I've seen it fail a number of times, it's impossible to sand as it's like chewing gum, it shrinks too. If you use it fill below the surface and then when dry over fill with red devil or similar.

veedee · 20 Jun 2019

I was just about to head out and purchase some Fibacryl too.

However given the mixed reviews in the thread, I think that I'll be sticking with standard, non-cracking caulk

Mr Sparkle · 20 Jun 2019

A do like products by Sika.. So I will give Sikaflex a try.

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

How To Deal With This Wall Crack?

Mr Sparkle

Attachments

blup

opps

opps

Mr Sparkle

ic1927

veedee

Mr Sparkle

DIYnot Local

Similar threads