Hh guys i went to look at a rear extention done about 12 years ago. and the client has some damp problems. all the skirting on the external walls have gone abit mushy. the walls have damp about 500mm high. its not condensation as the client has a dehumidifier which takes care of that. theres no more condensation on the windows. outside the property the render has gone quite sandy and you can scrape it of very easily. also at the bottom all around the whole house is a small gully were the slowly goes away into a drain but the water will sit there for hours. the air bricks around the house are literally ground level more aless. and water can get in there. its a hard one on what i can do to cure the place for the client. ive said i will take the render of and waterproof the scratch and rerender the whole extension. put a drip bead at the bottom and around windows and doors. as for the bottom i was gona take the slabs up dig down a bit and lay them back but slight fall from the extention. the inside got hacked of 600mm and replastered a year ago but the guy who did it done it in one day. he tanked it and muti the wall same day notshore how with the drying times. its cracked everywhere. and was filled then painted. does anyone know if i can move the air brick up aswell. one more thing it was damp injected aswell by the same guy but this hasnt worked. whats the best way to tackler the situation. please some genuine advice thanx tony
need some help here
- Thread starter hirst
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i think that the first thing to deal with is the gully [french drain] that is full of water. this must be able to be drained away from the house. the water table is very high this year i have seen water coming up through block paving, and the a12 road where they are below the water table. then cut off render and damaged plasterwork and let the building dry out. then you will be able to carry out remedial work
hi guys yea does sound a little fishy but the client is genuine ive a load of work for him. i think i gona strip the render of outside and lower the paveing with a fall. rerender with a dampproofer. but i hear so much bad reviews on waterproofing render. sometimes i dont know what to expect even when u do a lovely job i want it to last 20 years plus for the client. as for the air bricks whats best to solting them out thanx for the threads
johniosaif
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Hi,hacking off 600 mm high seems odd, 1.2m would be my minimum, also a new extension should not have needed a silicone injection, tanking is never a one day process, probably a quick dampproof and skimming it green. sounds also like a weak mix. I would sort the outside as advised and hack off all the render inside and return walls at least a metre around the corners. use a sika 1 mix at s/c 4 to 1 but dry the wall out firstly inside with heater and dehumidifier, no quick fix possible unless you want to use membrane for tanking ,batten and plasterboard. Not cheap either though
hi john thanx for the message. yea i will hack of at minium of 1.2 high. on the outside i will use sika. in the scratch but not the top coat. if i put the scratch on in the morning do you you think i could put the top coat aswell same day. or shall i let it go of for a day or so. i think im gona have alot of trouble with the air bricks. as there so low down and i if i lift them it probably be above dpc. or where they injected. i was thinking of doing te rendering and lowering the paveing with out touching the air bricks. and see if that cures it. inside was done badly but if i cure the outside do you think i could save money for the client on the inside by leaving it to dry out on the walls.
carlos
Private Member
As Gibbo said,but if your going to persist in DIY
See here >>>> http://www.plasterersforum.com/plas...on-guides/29662-damp-proofing-plastering.html <<<<
See here >>>> http://www.plasterersforum.com/plas...on-guides/29662-damp-proofing-plastering.html <<<<
ds. yes i see what your saying.but ive done loads and loads of internal tanking. work with two old men who specialize in this but they. but have lost contact with them. the client had a specialist come round and do work but hasnt cured it. then he tryed a different one and still they just charged him through the roof. i know what the problem is. it is visual. i just want to know the best mix to use realy. its onto thermalit blocks. for the render. im gona drop the path this holding way to much water. right on the air bricks. ill flow the water away from the extention. clear air bricks, hack of the render and rerender with a waterproofer in the scratch. use drip beads. and do a plimth befor hand. below dpc. what else do you rteckon will help. as he wants me to do the job and im gona do it right. thanx for the updates guys.
carlos
Private Member
If you new what you were doing you would know what sand and mix to use.
See if this helps>>>>>>>>>>http://www.permagard.co.uk/render-additive-waterproofer.html<<<<<<<<<<
See if this helps>>>>>>>>>>http://www.permagard.co.uk/render-additive-waterproofer.html<<<<<<<<<<
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as i said already evryone has different views. thanx again tony
keithuk
Private Member
Hirst ,that is life mate ,we all do things different ,whats wright for one and all that ,best of luck hope it goes well for you
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