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by the specialist
Mon Jun 22, 2009 6:53 pm
Forum: Brickwork and Blockwork Forum
Topic: How to fill gap between concrete slab and external wall
Replies: 2
Views: 34062

polymer modified water repellant cement. It wont crack or shrink and it works - I have used it several times for sealing a wall to floor joint. Triton Chemical sell it - They call it Triton Fillet seal. It's not cheap. The advantage of this over ordinary cement based products is that it copes with t...
by the specialist
Mon Jun 22, 2009 6:48 pm
Forum: Brickwork and Blockwork Forum
Topic: CAVITY WALLS
Replies: 4
Views: 4219

Hi Firstly I guess you are talking new build from your question. The only products you can use have to be approved so you should check with building control. Secondly it is actually a myth that fulfill cavity wall insulation causes damp in properties. The cavity wall was designed to stop moisture tr...
by the specialist
Wed Jun 03, 2009 8:45 pm
Forum: Lofts and Loft Conversions Forum
Topic: Floor Joists
Replies: 7
Views: 6490

Hi In my experience I have never seen a roof supported on 3" joists. The timbers you describe sound like "strings" put in during construction to hold the joists in place and stop sag. The roof usually sits on a wall plate on the inner leaf. To stop roof spread there are usually purlin...
by the specialist
Tue Jun 02, 2009 9:30 pm
Forum: Damp and Damp Proofing Forum
Topic: How rusty does a wall tie need to be to merit replacement?
Replies: 4
Views: 5729

Hi Its good that the tie was still strong. If it wasn't you could have a big problem. Wall ties hold the outer wall to the inner wall. The roof usually sits on the inner wall. When the wall ties fail in sufficient numbers the outer wall becomes unstabel and can fall away (collapse) Once wall ties st...
by the specialist
Tue Jun 02, 2009 9:22 pm
Forum: Damp and Damp Proofing Forum
Topic: I cant find the damp!
Replies: 11
Views: 6628

sian you say the property has a damp proof course. Is this the original or is it a remedial dpc? If the latter electrical moisture meters are not an acceptable method of testing the efficacy of a remedial dpc (as per the guidelines of the bwpda) This is because some ground salts which may be present...
by the specialist
Thu May 07, 2009 7:35 pm
Forum: Damp and Damp Proofing Forum
Topic: Dry rot in joists
Replies: 6
Views: 5055

Hi again, How do I view the photo's?

Aidan
by the specialist
Tue May 05, 2009 12:07 am
Forum: Damp and Damp Proofing Forum
Topic: Dry rot in joists
Replies: 6
Views: 5055

Hi, Have you any photo's you can post? True dry rot although destructive won't get much worse in 2 weeks so don't panic. Also if it really is dry rot the remedy's you have mentioned don't appear to treat the cause. If timber is just wet from being in contact with damp masonry it usually is wet rot. ...
by the specialist
Tue Feb 10, 2009 9:19 pm
Forum: Damp and Damp Proofing Forum
Topic: Damp in all rooms!!
Replies: 1
Views: 3366

The damp isn't coming into the house - It's trying to get out!

It is condensation. If you look in the projects section on here you will find a lot more information. Sorry but I haven't got time to go through it all just now.

Good Luck.
by the specialist
Sun Feb 08, 2009 7:31 pm
Forum: Damp and Damp Proofing Forum
Topic: Damp or smelly chipboard - how to sort out ?
Replies: 4
Views: 28462

Hi It could simply be condensation. However First question is how old is your house? I ask this because if its not a new house it means the floorboards have been replaced with chipboard. This only happens if there has been a problem with the floor previously. Is the smell a musty one? Please advise ...
by the specialist
Sun Feb 08, 2009 1:47 pm
Forum: Conversion, Refurbishment and Renovation Forum
Topic: Cellar Conversion
Replies: 4
Views: 5091

[quote="Perry525"]Unless a cellar is waterproof when built, it is very expensive to make it dry enough to use as a living room. Coatings have no mechanical strength and cannot keep water inside a wall. What do you intend to do with it?[/quote] Which is why I recommended using a cdm (cavity...
by the specialist
Sun Feb 08, 2009 1:45 pm
Forum: Conversion, Refurbishment and Renovation Forum
Topic: Ineffective woodworm treatment?
Replies: 2
Views: 5901

If you still have beetles emerging after 3 years you should insist on re-treatment. However if the timbers you find woodworm in were not accessible for treatment originally they won't be covered by the guarantee. When I took my examinations I was taught that the poison killed the emerging beetle - s...
by the specialist
Sun Feb 08, 2009 1:27 pm
Forum: Damp and Damp Proofing Forum
Topic: Damp proof coursing failed after 2 years.
Replies: 5
Views: 4388

Hi Again, I'm still thinking condensation. The black spot mould is Aspergillus niger spp. The spores are omnipresent but can only grow when conditions are right. They need pure water which is what you get as a result of evapouration and condensation. Ground water is contaminated with salts which won...
by the specialist
Thu Feb 05, 2009 8:36 pm
Forum: Builders and Builders Merchants Forum
Topic: Drilling into Breeze Block to put up a shelf
Replies: 5
Views: 43884

Hi depending on what you want to fix you could use a thunderbolt or rapier fix. These fixings will drive straight into light weight blocks quite easily with a cordless driver. If you haven't used them try one in solid masonry for which you drill a pilot hole. No rawl plugs required!
by the specialist
Thu Feb 05, 2009 8:31 pm
Forum: Barn Conversions Forum
Topic: Injected Damp Proof - do they work? Help!
Replies: 4
Views: 12253

Hi, Traditional silicone injection won't work. Neither will the modern method of injecting creams into mortar beds. You have 2 options with a remedial dpc in this type of construction. 1. Injection mortar. 2. Electro osmosis. It has to be put in above ground level so if you have any wall below groun...
by the specialist
Thu Feb 05, 2009 8:21 pm
Forum: Architecture, Self Build and Design Forum
Topic: roof strength
Replies: 2
Views: 4078

Sounds like they may have taken out collar ties which help to stop roof spread. You should get a structural engineer to look at it.

Aidan
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