How
to inject Cracks - summary for a range of crack widths
1.
Clean the crack using either a sharp, pointed tool, grinding wheel, cutting disc,
Allsaw or rotary saw.
2.
Remove all dust by brush or vacuum.
3.
Push the injection needle or nozzle (diameter chosen according to crack width)
to the base of the crack and slowly inject resin
Crack
in a rendered wall before cleaning. Splits or 'shakes' in a timber beam. Slot
cut out wide, ready for filling.
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How
to choose a crack repair method and material by Crack Width
1.
Using Thixotropic Injection Resin - slow set version - sets after 2.5 hours
Hairline
Cracks -
less than 2mm wide - indirect, fill Syringe Method, with fine needles, or cut
out to 5mm +
Syringes with needles
- use Thixotropic Epoxy Slow
Set (non slump),
or Epoxy
Primer (runny) without needles, pushed into 4mm holes at 50mm
centres.
For
Voids you can Inject Polyurethane
Liquid - using Syringes, no needles. The Polyurethane reacts with moisture
in the timber, expands rapidly and sets within 5 to 15 minutes.
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2mm
to 4mm - direct Cartridge Injection Method, with
2mm needle, or cut out to 5mm +
Needle
fitted to 400cc Cartridge - use Thixotropic Epoxy Slow Set (non
slump).
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5mm
+ - direct
Cartridge Injection Method, with plastic pointed nozzle, or cut out to 10mm +
Standard
pointed nozzle - tapers, cut to suit hole. Standard 400cc tube. Injecting a slot
behind a plastic cover.
Cone pointed plastic
nozzle for 400cc or 1000cc
- cut to 5mm hole diameter
Cartridge - use Thixotropic
Injection Resin or Slow Set version
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General
principle -
where possible,
for the strongest repair, cut out the cracks with a saw, Router, masonry grinder,
or Allsaw, to form square edged slots, and remove all dust and debris. Avoid V
shaped slots - the repair will be much weaker.
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.
It is important to establish and eliminate the underlying cause of the cracking
before Injection, otherwise further cracks are sure to appear.
Tell
Tales - install our Tell Tail plastic crack movement measuring units and monitor
for 3 months, if you are not sure that movement has ceased.
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How to make
cosmetic Injection Repairs - matching colour or texture
1.
Using Thixotropic Injection Resins - standard or slow set - colour options:
-
basic resin colour - sand/buff - matches yellow/light brown
-
grey - Additive - pour in pigment into the resin Base (Part B) of the product
-
red - Additive - pour in pigment into the resin Base (Part B) of the product
2.
Using Mouldable Epoxy Putty - colour options:
-
basic resin colour - sand/buff - matches yellow/light brown
-
grey - add black Mortar Powder - mix powder into the mixed product
-
red - add Red Mortar Powder - mix powder into the mixed product
-
white - add White Mortar Powder - mix powder into the mixed product
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3.
All Products - obtaining colour and texture over a repair using original Site
materials:
- grind up wood,
stone, brick or mortar to a dust - apply to the wet product surfaces
- or apply dust to an
additional wet coat of Epoxy
Primer after the injected product has set
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