How to build a shower base?

[Sedg]

Hello again

i posted a question regarding framing the other week and recieved some great help, thank you. now i am measuring and locating where the new wall will go and i see the recess in the concrete overlaps the location for the new frame about 40mm. also the recess for the shower is very rough and not square, it is just over 1000 long and wide with rough edges and varies in depth 70 - 90 mm deep.

obviously i need to reshape and fill this "whole" can you suggest how ? should i build a square box and center is and fill the outside with grout or concrete or something else? and what about the base or floor area, surley that will require rendering with something

here are some pictures, i hope you can help oh ftu the copper pipes will go and i will re blumb with PEX. thank you

[Sedg]

Thanks Eric

im almost finished, Tiling completed and shower screen installed

i am just completing painting however on one wall in one area i could not get the paint to adhere, even after sanding.

i sanded the wall back to the villa board and put a light coat of plaster but again its cracking

do you have any suggestions?cracking plaster in one area

[MitchellMc]

Hi @Sedg,

That looks more like an issue with the plaster rather than the paint itself. What was the surface like before you painted? It’s possible the plaster wasn’t fully dry, which can lead to cracking and poor adhesion. The cracking you’re seeing suggests the base isn’t stable, so you’ll likely need to sand back the affected area, removing both the paint and any loose plaster. Once back to a solid surface, apply a thin skim coat of plaster and allow it to dry thoroughly before sanding smooth. It’s always best to apply an undercoat over bare plaster before applying your topcoat to ensure proper adhesion.

Please let me know if you have any questions.

Mitchell

[Sedg]

Thanks Mitchel

i took it back to bare villaboard and left it a couple of days to ensure there was no moisture

i think the layer of plaster i used may be too thick

im using Gyprok wet area base coat. i have not had any other issues with this product

ill remove all of it an try again

keep you posted

regards

[MitchellMc]

For thicker areas, it's always best to do several thinner coats rather than one thick one @Sedg. I wouldn't apply more than 3mm in one coat.

Mitchell

[Sedg]

Hi Guys

i had previously sanded back to bare villa board, previous to the cracking

yesterday i peeled off the plaster and cut out an replaced the section of board, about 600 x 400

then i started again with a very light plaster, so far it looks ok, i will sand and do another light coat

it was either something in the board itself or plaster was too thick so i have eliminated both

keep you posted

regards

Steve

[MitchellMc]

Sounds like a great approach, @Sedg.

Mitchell