waterproof concrete

Using Basement Expert Ltd to ensure your concrete structure has no leaks means all work will be done properly under genuine supervision.

Purchasing.
  1. The powerful plasticiser that makes the mix waterproof.

  2. Supervision.

  3. Testing.

  4. FRP formwork rods and nuts.

  5. Poker hire - so that we know the pokers work properly.

  6. Guarantee.


If you need the guarantee then you need to buy the full list above for all the waterproof concrete, as appropriate.

You also need to arrange your pours so that all the concreting can be done very well. We will help you with that.

However the guarantee is free.


Please note we do not require any tapes or strips in joints. We require all joints to be scabbled, cleaned, kept clean and poured properly.

Neither will you need to seal any holes left by formwork threaded bar, because you cast our FRP threaded rods in and cut them off.

Therefore we will save the contractor a lot of money and worry.

If you do not need the guarantee then you can buy just what you need.

The liquid powerful plasticiser has a base cost of just 99 pence (in bulk) to dose each cubic metre of concrete if you want to dose it yourself.
  1. Without the guarantee, dosing the plasticiser yourself, the powerful plasticiser is £5 per m³ dose.

    If you want the guarantee then the plasticiser is £23 per m³ dose.

  2. Site Supervision is £300 a visit (max. 5 hours on site) plus travel and accommodation if over 2 hours or 120 miles from Stevenage SG2 7NX.

  3. Testing to BS EN 12390 part 8 is £650 a set including mould hire and cube making. We must be on site supervising.

  4. You can also buy formwork threaded rod that gets cast in so there are no holes to repair. These are described on our Basement Expert Ltd page of products.

  5. Poker hire is for two High-frequency internal vibrators. You need to supply separate 110V power to both (purely to provide a backup if one power supply fails). Any cleaning required after the pour will be charged.

  6. The Guarantee against visible ingress of water is free if all our instructions were followed.


Also, you need to pay for any new packaging and delivery.


Please note that to guarantee the structure is leak free, pours are subject to a minimum of £1,000 + VAT per visit. This would usually be a supervision charge, 30 cubic metres of concrete poured and poker hire.



Approx 400 doses costs only £396 + VAT if you collect a plastic barrel from our warehouse
(near Stevenage in Herts).

All prices plus 20% VAT.
 

Specifying.

You only need specify
  1. Minimum C35 or C40

  2. Maximum 5mm penetration of water under pressure.
Cubes to be taken and tested to BS EN 12390 parts 3 & 8.


If you want proper supervision, with teeth, of ALL the waterproof concreting, then specify that the contractor must obtain a guarantee from Basement Expert Ltd.

This will compel the contractor to pay for
  1. The powerful plasticiser that makes the mix waterproof.

  2. Supervision.

  3. And Testing.

  4. If the contractor does as he is told then the Guarantee will be free of charge. Otherwise the contractor will be made to pay for repairs before the guarantee is issued.


  5. Unlike any other supplier, I will guarantee that concrete and workmanship carried out as explained on this web site and supervised by me will not visibly leak, or else I will fix the leaks. And as well as that unique promise, I will repair the leaks for free.



    The mix.

    P350 (assuming 20mm aggregate, or else P380 for 10mm aggregate)
    Over sanded for pumping.

    You also need to make sure it is workable on site so that the workforce don't add water.
    That means a slump in the range S3 which will compel the concrete producer to add a suitably powerful plasticiser.

    Most concrete nowadays is CEM 1, pure OPC, because coal fired electricity and steel making are in steep decline in the UK.

    That means you must make sure that you have enough steel to control crack widths in concrete likely to get hot. We have more information on the Info For Specifiers page.



    Please note two points.

    1. We do not require any tapes or strips in joints. We require all joints to be reinforced, scabbled, cleaned, kept clean and poured properly.

      You are free to include any joint treatment you wish but we will still require the contractor to scabble joints, clean them etc. to the old BS 8007.

      More information on our Joints page.

    2. We do not allow kickers in waterproof concrete. It is IMPOSSIBLE to form a sensible kicker properly and waterproof. We will help the contractor choose a kickerless system that suits him.

      More information on our Kickers page.






Call me, Phil Sacre:

01438 900303




07773 377087




Email me:

philsacre@basementexpert.co.uk









We believe that our guarantee is the only genuinely useful guarantee in the marketplace.

If you think differently, then insist on a copy of the guarantee from whomever you prefer to specify.

You will find, I believe, that Caltite, Pudlo, Sika and so on will make all manner of excuses and not provide you with their actual wording.

Kryton is the only publicly available guarantee we have seen. We reproduce it on our Kryton page under 'Others examined' in our menu above. It excludes absolutely everything you would want from a guarantee.

I hear engineers tell me that Caltite is the Rolls Royce of waterproofers. Yet if you truly understood their BBA certificate you would know it is evidence (other academic evidence is available) that Everdure Caltite does not work beneath ground where it cannot fully dry.

And their guarantee, reproduced on our page about Caltite, just like Kryton's, excludes absolutely everything you would want from a guarantee.

If Caltite is considered the Rolls Royce then Pudlo might be considered the Bentley. But it's BBA certificate proves only that it made concrete more watertight when they reduced the water cement ratio as well as adding about 8kg of cementicious powder. The BBA certificate for Pudlo provides no evidence that the concrete used on site will be waterproof as a result of adding Pudlo powder.