Tech info 1.indd

1:1:6 Clay only 1:9 Clay&Calsi 1:2:9 Clay only Half brick FBS/
Half brick NFP
One brick NFP
Half brick Maxi
One brick Maxi
Round off cement and lime Quantities to the nearest full pocket and sand quantities to the nearest 0.5m3 SMOKE AND SOOT
For the record, to produce 1000 litres (1m3) of mortar requires Scrub with a household detergent. The more stubborn patches can be pulled from the brick pores using a poultice based on trichlorethylene, although good ventilation is essential indoors.
1:6 – 6.8 pockets cement: 1,34m3 sand1:1:6 – 5,8 pockets cement : 5,8 pockets lime : 1,16m3 sand LIME BLOOM
Class III
Lime bloom and streaks may be present from the autoclaving process, and will tend to mask the colour of the brick. The 1:2:9 – 3,9 pocket cement: 7,8 pockets lime: 1,17m3 sand recommended brickwork cleaning process is as follows:-Wet a 1 to 2 metre width of brickwork with clean water.
N.B. For mortar mix requirements for Calcium Silicate Bricks
-Immediately scrub wetted area thoroughly with a diluted please contact the Building Advice Bureau.
solution of a proprietary acid cleaner (1 part cleaner: 20parts water).
-Immediately wash down the scrubbed area with fresh clean water.
These can be killed with a 10% copper sulphate/water solution; DO Protect bricks and unfinished brickwork from becoming
or a proprietary weedkiller recommended by the makers.
There will usually be an obvious black residue of dead of dead DO Ensure that all safety measures are taken when handling
material which should be removed by scrubbing with water.
and using chemicals and that first –aid measures are Vegetable growth is generally indicative of damp brickwork and may reappear if this basic cause is not cured.
DO Identify the nature of the masonry to be cleaned and the
type of stain or deposit to be removed.
DO Consult Corobrik in case of doubt.
Wash down with a solution of oxalic acid (1 part to 10 parts of DO Carry out trials on small areas of masonry well before the
main cleaning operation is started.
DO Ensure that the masonry is adequately wetted before
TIMBER (brown or grey)
surface application of chemicals, and, unless stated to the These stains are due to water spreading tannin or resin from the contrary, remove all trace of the chemical afterwards.
timber across the bricks and motar, and they can normally be DO Allow efflorescences to disappear away naturally whenever
removed by scrubbing with a 1:40 solution of oxalic in hot water.
DO Ensure a high level of ventilation when chemicals are used
Water running regularly down the surface of brickwork produces DO Protect vulnerable metalwork and other materials and plants
pattern staining which frequently can be removed by scrubbing from chemical liquids, fumes and spray.
after wetting with a high pressure mist spray of cold water. If this DO NOT Clean brickwork which is exposed to hot sunlight.
is not effective, the treatment recommended for motar should be DO NOT Use wire brushes or other abrasive methods on brick
DO NOT Allow chemicals and washings to contaminate
As much as possible should be removed, first by scraping, then by scrubbing with water and emulsifying detergent. Allow to dry, then, if necessary, poultice with paraffin. Do not wet brickwork first.
Wash down with a solution of oxalic acid (1part to 10parts of Staining can mar the appearance of brickwork, but incorrect cleaning techniques can cause permanent damage; consequently, any proposed method of cleaning should be left (Brown staining which does not respond to this treatment, far as long as possible, but at least a week or so, to judge the particularly at the junction of the brick and mortar is probably results before the whole job is tackled.
The techniques given here are intended for ‘do-it-yourself’ work in removing relatively small areas of staining. A specialist MANGANESE
contractor should be engaged for cleaning large areas of Brush the stain with a solution of 1 part acetic acid and 1 part brickwork, for example general cleaning of industrial grime from hydrogen peroxide in 6 parts of water.
It is preferable to use wooden scrapers and stiff fibre brushes to avoid damaging the bricks; but where chemicals are to prevent Where possible, remove larger pieces with a scrapper, then it absorbing the chemicals, and rinsed thoroughly with clean wash down with a dilute solution of a proprietary acid cleaner. water afterwards. Adjacent features such as metal windows The manufacture’s instructions must be strictly followed. and the area at the foot of the wall should be protected from To remove mortar smear from brickwork having a potential to exhibit vanadium staining, the following procedure is recommended: In places where it is not possible to make a mess or where the stain is very localised, most of the cleaning liquids can 1. Wet the brickwork thoroughly with water.
be applied by thickening them with an inert filler such as talc, bentonite or powdered chalk. 2. Remove any mortar with a proprietary acid cleaner.
Many of the chemicals recommended are caustic or
3. Remove any residual acid in the brickwork by poisonous, so that care should be taken and protective
clothing and goggled should be worn. Volatile solvents
should only be used indoors under conditions of good

4. Treat the brickwork with a 10% solution of caustic ventilation.
soda or a 2% solution of potassium carbonate to prevent the reoccurance of stain.
Cleaning technique differ in some cases for clay and calcium silicate bricks, so it is necessary to identify the brick in question. It is also essential to identify the type of stain or deposit before Follow treatment recommended for “Mortar”.
any cleaning operations are undertaken.
Except where bricks are liable to surface damage, remove Remember to thoroughly wet the brickwork with clean water excess with a scraper, then scrub with water and an emulsifying before applying any chemical, and wash down with clean water detergent. If necessary, finally sponge or poultice with paraffin. Do not wet brickwork with water first.
It is always advisable to consult with us before embarking upon
any cleaning of Calcium Silicate brickwork, particularly where it is needed to use an acid.
This usually disappears rapidly from new brickwork due to the action of wind and rain. Brushing or sponging down the wall Remember to thoroughly wet the brickwork with clean water at times of maximum efflorescence will also help. The salts before applying any chemical, and rinse with clean water brushed off should not be allowed to accumulate at the base of wall; otherwise they may be carried back into brickwork by subsequent rain.
Scrub with an oil emulsifying detergent in water. Allow to dry
VANADIUM (green)
thoroughly; then, if necessary, poultice with white spirit, carbon tetrachloride or trichloroethylene. Good ventilation is essential Wash down with a solution of the sodium salt of ethylene diamine tetra acetic acid (1 part to 10 parts of water) or a 10% caustic soda solution. Do not wash the wall with clean water afterwards. (Hydrochloric acid should never be used on Apply commercial paint remover or a solution of trisodium vanadium stains since it fixes them and turns them brown. Such phosphate (1part to 5parts water by mass); allow the paint to brown stains can sometimes be removed using a strong caustic soften and remove with a scraper. Wash the wall with soapy soda solution, but there is a risk of damaging the bricks.) water and finally rinse with water. In very bad cases it may be necessary to grind off the face of the brickwork in the affected MORTAR
Larger pieces of mortar should be removed by means of a
bolster.The balance of the mortar may then be removed by
either scrubbing down with a diluted detergent (Teepol) or by means of a high pressure waterjet. A range of portable high pressure units have proved.


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