Cement floor for inside steel shed

Nodferatu

I have a steel shed 10ft x 14ft bolted down on a cement foundation that i want to lay a layer of cement floor down inside. To cover the bolts. The reason being i need to damp proof the floor and lay timber floor on afterwards. Im not sure how to do it or what material i need for the damp proof. Would polythene sheeting do?

Bonzo Delaney

Nodferatu wrote: »

I have a steel shed 10ft x 14ft bolted down on a cement foundation that i want to lay a layer of cement floor down inside. To cover the bolts. The reason being i need to damp proof the floor and lay timber floor on afterwards. Im not sure how to do it or what material i need for the damp proof. Would polythene sheeting do?

Depends on how much height you can rise the floor by and what the shed is going to be used for. If there's a timber floor going in I'd imagine an office of sorts if so I'd prob go

1200 gauge polythene DPC
25 mm thick high density insulation on the floor and up the wall edges
Some recommend 500 gauge polythene over this to protect the insulation from reacting with the cement.
Then a 50 mm screed/ floor over this 25n10 would be grand. Or else a good sand / cement screed.
Then folow floor manufacturers instructions on how to proceed from a concrete floor

Nodferatu

Its going to use it as an outdoor office. So yeah i can rise it about 2 inches.

Bonzo Delaney

Thinking about it if you can only spare 2 inches
1200 g polythene
25 mm high density insulation
Then fix 18 mm osb 3 board over this using 100 mm anchors in to the concrete base
Then your floating foam and timber floor.
It'd be a lot quicker and less messy than concrete

Nodferatu

Thanks bonzo, maybe i got the measurment wrong but 2-3 there abouts. But i'll take what you said onboard. Thanks for the help.

Calahonda52

Can you post a picture or two of the bolts as well as the floor wall connection
while what is proposed above is grand, you run the risk of the bolts cutting through the plastic.
Also, you need to cater for dealing with driving rain under the perimeter.
How well sealed is that?
As its an outdoor office, whats the 2-3 inch restriction, have you a flat ceiling?

This will help with the poly laying, you certainly need the single tape.

Also the timber floor would need to be ventilated