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waterproofing mortar with silicone oil

05/28/2008 9:33 AM

My [1964] house has an external, waterproof rendering (pebble-dash) over the brick cavity wall to keep the wet Scottish weather out. Some small repairs have been done to damaged parts or where holes have later been cut through the wall. Some of these have been done with ordinary brick mortar,which seems to be highly porous.

How can I waterproof these small areas? Can I add (spray) oil, that would be absorbed by the cement and provide water-repelling qualities? Would a silicone oil be better? Are there other alternatives that I should be looking at? I do not want to redo all the little places that are or could provide water ingress with waterproof rendering.

Are there established protocols for this sort of thing? Has anyone else done similar? Are there any dangers involved? The largest area is about a decimetre squared; most others are just a few square centimetres around a pipe.

Many thanks

Andy

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#1

Re: waterproofing mortar with silicone oil

05/28/2008 10:23 AM

When faced with waterproofing a decorative brick structure in a bathroom recently, two coats of a silicone brick waterproofing agent came as a strong recommendation from a local specialist decorative materials retailer. Sufficient to cover 4m2 cost, from memory, cost about £5GBP. There must be something in B&Q (other retail outlets are available) that would do this job?

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#2

Re: waterproofing mortar with silicone oil

05/28/2008 12:42 PM

Thompson's Water Seal or other like product for sealing concrete. Put in a pump style sprayer and spray in the problem areas.

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#3
In reply to #2

Re: waterproofing mortar with silicone oil

05/29/2008 3:01 AM

That's the stuff!

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#4
In reply to #3

Re: waterproofing mortar with silicone oil

05/29/2008 3:43 AM

Excellent. Thanks. What does this contain? We have a B&Q 16miles away, so I could pop in next time we're passing through. It may be available in the other places we have in town here.

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#5

Re: waterproofing mortar with silicone oil

05/29/2008 10:33 AM

Use Cement grade 53(pozzolana portland cement-- PPC) one part and quartz silica sand(chemically inert,washed, graded and dried, grain size should not be more than 2.O millimeter ,grains of sand either round or rectangular in shape) and make firstly dry mortar for ready to use.This ready mix mortar when used for wall plastering/repairing/pointing/cavity filling etc,limited water for good workability is required to mix and prepare wet mortar for application.if small quantity of sodium silicate or potassium silicate is dissolved in water before addition to dry mortar will work for strong binder as well as good water proofing material.

please note that the compressive strength(for 28 days) of the dry mortar should be(before addition of sodium or potassium silicate) between5 to 7.5 N/mm2 or 50 to 75 kgf/cm2 as 1N/mm2=10kgf/cm2.

AFTER THE ADDITION OF ABOVE SAID WATER PROOFING AGENT- SILICATES(POTASSIUM IS BETTER THAN SODIUM IF AVAILABLE IN YOUR MARKET.) IN LIMITED WATER ,(CONSTANT PH VALUE IS REQUIRED TO MAINTAIN FOR GETTING THE GOOD RESULTS)YOU ADD THIS SOLUTION TO YOUR READY TO USE DRY MIX MORTAR ,YOU WILL GET RESULTS MUCH HIGHER THAN ABOVE MENTIONED RESULTS.

WATER PROOFING AGENT MEANS A MIXTURE OF SILICATE AND WATER WITH A FIX PH VALUE ACCORDING TO USE.---SHAILENDRA SHUKLA

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#6
In reply to #5

Re: waterproofing mortar with silicone oil

05/29/2008 11:31 AM

Are you suggesting that he replace the existing mortar, rather than spray it with a water proofing agent?

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#8
In reply to #6

Re: waterproofing mortar with silicone oil

05/31/2008 12:03 AM

where rectangular word is used by typographical mistake ,please read angular in place of rectangular.

This is up to actual user whether replace the existing one or not,i am giving a solution of said problem.

YOU SHOULD ALSO KNOW THE STEREOCHROMY.

STEREOCHROMATIC COLORS CAN BE BOUGHT GROUND IN A THICKLY LIQUID WATER GLASS SOLUTION.THEY ARE ONLY DILUTED WITH WATER-GLASS SOLUTION ONLY BEFORE APPLICATION ON WALLS.WATER-GLASS MEANS EITHER SODIUM OR POTASSIUM SILICATE i.e.as a,good binder ,good cementing quality,good water proofing agent.ABOVE IS NOT A SUBJECT MATTER HENCE TELL YOU LATER WHENEVER ASK BY YOU OR BY SOME BODY ELSE.===SHAILENDRA SHUKLA

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#7

Re: waterproofing mortar with silicone oil

05/29/2008 1:54 PM

I technique I remember from an old Scot mason was to use WaterGlass aka potasssium silicate which binds to the silica in the wall. It can be use as a paint and a sealer http://www.networkearth.org/naturalbuilding/paints.html

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#9
In reply to #7

Re: waterproofing mortar with silicone oil

06/02/2008 5:15 AM

Thanks for this excellent idea. After doing a little research, I see that it is usually sodium silicate that is referred to as waterglass. The potassium compound is called "silicate of potash" and is more expensive. Either of these can be found in "silicate mineral paint", and can be used to stain cement and concrete as well as provide the waterproofing that I am after.

Is it important that I use potassium silicate or can sodium silicate do the job?

Thanks.

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Anonymous Poster
#10
In reply to #9

Re: waterproofing mortar with silicone oil

06/02/2008 3:12 PM

I went back to my book The Art of The Stone Mason by Ian Cramb and he defines water glass as a concentrated and viscous solution of sodium or potassium silicate however the reference I earlier left you said it is only Potassium silicate.( most other sites list Sodium as water glass) He also mentions using boiled linseed oil for sealing stone . Looking for more info on chemical sites I find the following

Sodium silicates tend to react with atmospheric CO2 to form carbonates and become progressively less water-soluble Potassium silicate film are less likely than sodium to develop a carbonate bloom or white efforescent coat of alkali carbonate .

One site that uses this material is Conproco but when you go to the site you do not see formulas but go to their MSDS sheet and see the chemicals they use for mixes and coatings

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