Crack Filling - Parapet repair with Epoxy Primer and Epoxy Mouldable Putty
Parapet Crack Repairs - how to choose a crack repair method and material in brick, stone, render and concrete.
General principle - cut out the cracks with a masonry grinder, or Allsaw, to form square edged slots, and remove all dust and debris
Repair Thickness - the more material that we can put in to the repair, in terms of width and depth, the better it will be able to accommodate natural movements caused by changing temperatures and therefore the better it will last.
Caution - Always consult a Structural Engineer and the building's Insurers before proceeding.
Fine to medium cracks in parapets - hairline to 15mm wide.
Cut out to - 5mm to 25mm in width
Apply Epoxy Primer liquid by brush and whilst tacky lay in the putty-like repair mortar, Mouldable Epoxy Putty.
Epoxy Primer - available in 500cc and 1 litre, two pot, liquids.
Mouldable Epoxy Putty - available in 500cc and 1 litre, two pot, putties.
Cracks need to be correctly cut out, square shouldered, dust blown out, ready to Prime and Fill
Mixing Mouldable Epoxy Putty in the gloved hand. Ideal for small repairs. It can be coloured to match masonry using our Mortar Powder.
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Larger holes and cracks in parapets - over 15mm wide
Cut out to - 20mm plus in width - can fill holes of any size.
Pour or inject Structural Epoxy Pouring Resin.
Structural Pouring Resin - available in 2.5 litre and 7.5 litre packs, containing two liquids and a powder.
Pouring Structural Pouring Resin - 7.5 litre.
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For cosmetic matching of colour or texture
You can add your own Site dust or chippings to the surface, (or ask for our Mortar Colour Powder), which you can mix into Mouldable Epoxy Putty, to be used as a surfacing finish.
Apply Epoxy Primer liquid by brush and whilst tacky lay in the putty-like repair mortar, Mouldable Epoxy Putty.
Epoxy Primer - available in 500cc and 1 litre, two pot, liquids.
Mouldable Epoxy Putty - available in 500cc and 1 litre, two pot, putties..
Mixing Mouldable Epoxy Putty in the gloved hand. Coloured ball of mixed putty to match masonry.
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Joint Filling - parapet joint repair with primer and cementitious filler
Parapet Joint Filling
Cut out the joint with a masonry grinder or disc cutter, to form a square edged slot and remove all dust and debris. Wet out the slot with fresh water and prime with BondAcryl.
Cut out to - 20mm plus in width - can fill a slot of any size.
Insert a waterproof pointing mix of either Fillet Seal (supplied as a powder) or Bondacryl mixed with sand and cement (no water).
Fillet Seal Powder - available in 25kg packs, or use Bondacryl with your own washed sand and cement - supplied in 2.5, 5.0 and 25 litre bottles.
Typical parapet joint problems - cut out the roof edge and fill. May require 'tanking' as well.
Mix up a mortar of 4:1 sharp, washed sand with fresh Portland Cement, using Bondacryl instead of water. Apply the mix to the primed slot and finish flush.
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Parapet Crack Injection - crack stabilisation using injected epoxy resins - injecting hollow patches
Parapet Crack Injection
To treat delamination or hollowness, drill a 5mm - 10mm diameter hole into the crack every 100mm to the depth of the separation between layers. (Hollow area). Inject Epoxy Primer or Thixotropic Injection Resin until it comes out of the next hole. Test for hollowness with a plastic hammer until the delaminated areas cease to sound hollow.
Injecting cracks in concrete using a syringe. Syringes - in 10cc, 20cc and 50cc sizes.
Epoxy Primer - available in 500cc and 1 litre, two pot, liquids.
Thixotropic Injection Resin - available in 400cc, two pot, gels, with cartridge kit.
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Parapet reinforcement - reinforcement with stainless rods and cementitious mortar
Reinforcing
Rusting reinforcement requires treatment, after full exposure. Give us a call for the cost of special rust proofing treatment.
Cut out the cracks with a masonry grinder to form square edged slots and remove all dust and debris. Wet out the slot with fresh water and inject the shrink compensated repair mortar, W60, using the Grout Master plastic applicator. Insert a length of stainless steel helical reinforcement bar, as per our Data Sheet (available free, on request). Apply further W60 Grout to fill the crack. Finish using the Finger Trowel. Always consult a Structural Engineer and the building's Insurers before proceeding.
Stepped crack in a Parapet Wall - will require Stitching.
Stainless Helical Bar
Supplied complete as a APRs Crack Filling Kit - Grout Master Applicator, Finger Pointing Trowel, W60 Grout, Mixing Paddle, or the materials and tools can be purchased individually.
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Rebedding and bonding Parapet Coping Stones
Epoxy Bonding for Parapet Copings
Remove the Parapet Copings and re-bed them in Epoxy Patching Mortar.
For smaller, smooth copings Epoxy Adhesive Paste can be used instead..
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Waterproofing parapet walls
Cement based Tanking for Parapet walls
Clean off all debris and make good all joints and cracks using W60 Flexible Crack Grout. Damp the faces with fresh water.
Apply two coats of Hydradry Tanking Slurry. This can take a Masonry Paint finish, if a non cement colour is required.
Slurry coats 1 and 2 brushed at 90 degrees to each other onto the damp wall.
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Site written by: David Moore
David Moore, B.A. (Hons.), C.T.I.S., C.R.D.S. Technical Author
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