First off hello everyone and thankyou for this informative forum which has been a great help as I renovate my house.
I needed to lower the floor of landing and bathroom so i removed the existing screed which was about 50mm thick from a concrete subbase - came away rather easily. There was approx 5mm of something on top of the screed which i guess was acting as the dpm.
I now need to make up about 30mm and also install a dpm. Enginered toungue and groove flooring with underlay will be laid on top and tiles in the bathroom. I was thinking of laying a plastic dpm and using a grano 2 part, sharp sand 2 part, cement 1 part screed as a floating / unbonded screed but dont know if 30mm is thick enough for this.
Another idea I have is to sbr bond the grano screed to the concrete and finish with an epoxy coating such as trimol 40 which says it can be used as a dpm. I really dont know what the best product to use is though and would need to know what kind of thickness is required so that I can lay the grano accordingly so it finishes at 30mm.
Or.. could i paint on a bitumen dmp to the concrete, followed by an adhesive and grano screed on top of that making it bonded - what adhesive is best?
My preference is for a the plastic dpm if 30mm is not too thin - I already have a big roll of the heavy duty stuff.
Many thanks for your advice guys.
I needed to lower the floor of landing and bathroom so i removed the existing screed which was about 50mm thick from a concrete subbase - came away rather easily. There was approx 5mm of something on top of the screed which i guess was acting as the dpm.
I now need to make up about 30mm and also install a dpm. Enginered toungue and groove flooring with underlay will be laid on top and tiles in the bathroom. I was thinking of laying a plastic dpm and using a grano 2 part, sharp sand 2 part, cement 1 part screed as a floating / unbonded screed but dont know if 30mm is thick enough for this.
Another idea I have is to sbr bond the grano screed to the concrete and finish with an epoxy coating such as trimol 40 which says it can be used as a dpm. I really dont know what the best product to use is though and would need to know what kind of thickness is required so that I can lay the grano accordingly so it finishes at 30mm.
Or.. could i paint on a bitumen dmp to the concrete, followed by an adhesive and grano screed on top of that making it bonded - what adhesive is best?
My preference is for a the plastic dpm if 30mm is not too thin - I already have a big roll of the heavy duty stuff.
Many thanks for your advice guys.