How to glue drywall to Lecawall?

[ByggaNytt]

Now it's time to go down into the mine and start decorating the basement level. The idea was to glue plasterboards directly onto the existing interior walls made of Leca. From what I understand, this can be done with, for example, joint compound/tile adhesive.

Does anyone have any experience/tips on this?

 

[ByggaNytt]

Found some info myself from Norgips, pages 18-20:

http://www.norgips.se/pdf/6_0_2004_1-20.pdf

Anyone with experience/tips?

 

[Phille]

Hey... I would probably avoid placing the plasterboard directly against the leca... buy ventilated hat profiles and attach them to the leca so you have something to screw the plasterboard onto.

 

[ngb]

Ask your local hardware store about the gyprocs handbook... Really good... everything you need to know about plasterboard is in there.

NGB

 

[Larsa]

Plaster on a wall of stone material is often glued with plaster mortar applied with a notched trowel.

 

[anaitis]

It's perfectly fine to use gypsum mortar to glue onto a stone wall! I did it myself recently when renovating the basement floor of my house.
We applied the gypsum mortar with a trowel since the walls were quite uneven. We laid 3-4 vertical strips of mortar on the old wall and then pressed the panels in place. It would likely work just as well to put the mortar on the back of the panel!
To ensure the wall was even, we used a straightedge when pressing the panels.

 

[tuffeuffe]

Yep, gipsbruk works well and is easy to work with.

 

[Phille]

It works perfectly to glue with gypsum mortar against a stone wall! I did it myself recently when I renovated the basement floor in my house.
We applied the gypsum mortar with a trowel because the walls were quite uneven. We placed 3 - 4 vertical strips of mortar on the old wall and then pressed the boards into place. It's probably just as good to apply the mortar on the back of the boards!
To make the wall even, we used a straightedge when we pressed the boards in place.

Yes, it works perfectly and is convenient...but you'll have problems in the future when it starts to blacken on the back of the plaster...use ventilated hat profiles so you get air/non-organic material behind the plaster...

 

[ByggaNytt]

The idea was not to make the wall even thicker than the original 150 leca + 2*13 gypsum.

Sure, ventilation can be good, and it also facilitates electrical wiring, etc. However, the question is IF ventilation is really needed :question

We are only talking about gypsum bonding of internal walls (not external walls), insulated slab (300), the basement level has been heated for 18 months so any remaining construction moisture should be gone, mechanical exhaust, etc. If the experts and Phille absolutely recommend ventilation, then it will be done! No problem BUT has anyone seen/experienced/believes that there will be problems with black spots = mold :question

 

[ÉlPon]

Can you avoid using paper tape for the joints when you have glued the boards with gypsum mortar and then putty? Neither the gypsum nor the leca wall should move, right? Or is it good to do it just in case anyway?

 

[rickardg]

Gypsum plaster is otherwise a variant so you don't have to worry about the paper in the drywall, resulting in a completely smooth surface like a drywall. We have gypsum plaster on all the exterior walls in the basement except in utility areas where there is cement-based plaster, (however, the interior walls are made of wood with regular drywall, but vapor barriers against all stone walls and floors)

 

[myrstack]

Can you avoid using paper tape for the joints when you've glued the boards with gypsum adhesive and then spackle? Neither gypsum nor the leca wall should move, right? Or is it best to do it just in case?

You should still use paper tape. Even if the substrate is basically not moving, leca and other "dead" substrates move slightly differently than gypsum. For instance, my joints on renovation gypsum glued on light concrete have a hairline crack in winter where there isn't any tape.