EPS/XPS (polystyrene) on glulam and plaster?

[rsa]

Hi!

Can you attach EPS/XPS to a glulam beam and then plaster on it?

See the images below. I have a carport where the main building is made of lightweight concrete and the carport itself is made of wood. Now I want the cornice (the decoration/steps up by the roof) to continue on the glulam beam and up to the ridge. Can I construct the cornice from EPS or XPS, screw it onto the glulam beam and then plaster on it?

This is how it looks today


This is how we're trying to make it look


Close-up of the issue


It should look something like on the house

 

[Annaonym]

Hello!

Can you attach EPS/XPS to a glulam beam and then plaster it?

See the pictures below. I have a carport where the main building consists of lightweight concrete and the carport itself of wood. Now I want the cornice (the decoration/steps up at the roof) to continue on the glulam beam and out at the ridge. Can I construct the cornice from EPS or XPS, screw it onto the glulam beam and then plaster it?

This is how it looks today
[image]

This is how we're trying to make it look
[image]

Close-up of the problem
[image]

It should look something like on the house
[image]

Do you have more pictures of the house's cornice? Where did you buy the foam plastic?

 

[rsa]

Do you have more pictures of the house's cornice? Where did you buy the cellplast?

What do you mean? I haven't bought any cellplast yet. My post is a question about whether it is possible to do as I describe.

 

[Annaonym]

What do you mean? I haven't bought any Styrofoam yet. My post is a question about whether it's possible to do as I describe.

I misunderstood you and thought the cornice on the car with your dwelling was made of Styrofoam, but now I understand that it is masonry.

 

[rsa]

I'll try again

Can you plaster on EPS (styrofoam)? One idea is still to glue/screw EPS onto the laminated beam and then plaster with thin plaster 10mm.

Will it work?

 

[rsa]

I have now test-glued some EPS S80. It seems to hold. The question is whether it's possible to glue the "form" to the laminated beam so that it holds when a bit of plaster is thrown on as well.

 

[danpih]

Hello! I have a similar question as you. Did you manage to build cornices and plaster them in place or are you still contemplating?

 

[rsa]

Hello! I have a similar consideration. Did you manage to build the cornice and plaster them in place, or are you still pondering?

Hi!

Yep, I have built the cornice from EPS, attached them to the glue-laminated beam with glue and screws, and plastered them 🙂

I staggered the joints to try to prevent cracking. However, there was a significant storm with gusty winds. When it blows that hard, the carport moves a little (mm), and that resulted in some cracks in the plaster. We'll fix that with some sealant when we paint everything 🙂

I also think that XPS is a better choice. EPS is a bit too "soft" and brittle. However, there is a price difference.

 

[Skotti]

Hello! I'm about to do something similar with my property. What kind of glue did you use to bond the foam with each other and also to the glulam beam? I'm planning to attach it to a brick/plastered facade myself.

Has it continued to crack like this a few years later?
Thanks in advance!