Browse Forums Building A New House 1 Jan 16, 2021 9:15 pm I used to know this.. or thought I did. Now I can't find the information. After the slab is poured the vapour membrane all sits at the edge of the slab often covered with leftover concrete. This then in most cases I have seen gets covered with rubble, soil and mortar drips etc. Ideally shouldn't the excess concrete be removed and the membrane lifted up against the sides of the slab to protect it and not provide a "ledge" for future moisture to sit up against the slab edge. In our previous house we had the membrane buried under concrete, rubble and soil and then paving (which had a damp course installed) but on the south side we noticed our slab edge was moist at times. So after a year in the house we removed the pavers and dug down and found the membrane and lifted if up and replaced the pavers with increased fall. We had no more slab moisture. But was it lifting the membrane or increasing the fall that did it? Long question short - should the vapour barrier be lifted up and flush to the slab edge not buried under all the rubble etc. If someone has a link to the info or knows that would be great! Thanks Re: Managing vapour membrane after slab pour 2Jan 17, 2021 8:35 am bluesteel Long question short - should the vapour barrier be lifted up and flush to the slab edge not buried under all the rubble etc. If someone has a link to the info or knows that would be great! Thanks An Alternate solution is to parge the side of the slab with a waterproof mortar or apply a liquid DPM paint (usually blue colour) That should be on your engineering plans as an alternate solution HTH Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Managing vapour membrane after slab pour 3Jan 17, 2021 11:03 am Thanks! So if a liquid damp proof membrane is applied to the side of the slab is the excess vapour barrier cut flush. Is there a detrimental effect having the vapour barrier buried under soil - ie does it encourage water to sit next to the slab because it can travel down? The concreter will take and reuse. In my case I bought structural LVLs and scraped them back and used them as joists. 1 5152 We were lucky in that our old house was so small (86 square metres) compared to the new house, they were able to take enough readings around the old backyard house before… 8 37142 you need to understand the breakdown of warranties. 90 warranty is considered as minor defects rectification period where as the longer ones are more major/structural… 1 5339 |