Tempo-PCE uses a variety of acrylic or polyurethane (PU) materials for waterproofing injection, which are used either on their own, or in conjunction with a structural injection process.
Tempo-PCE’s method of low to medium pressure injection avoids movement to the brickwork or backfill. It also assists absorption, because the injected material can easily replace water or air in the structure. The materials penetrate the finest capillaries in brickwork. This suits acrylic injection due to the material’s low viscosity. The low-pressure approach allows work from underneath the soffit, with the structure remaining in full use – offering a low-impact alternative to conventional methods of repair. For example, in most cases, traffic management is unnecessary.
The use of an acrylic resin gives a longer open-time, improving absorption into the brick & backfill and giving increased flexibility over standard polyurethane. The acrylic resin can also be used with very short open times allowing the injector to control carefully the amount of injected material and therefore its location. The blend also allows the probe diameter to be as small as 10mm, helping to retain the visual appearance of, for example, a listed structure.
Tempo-PCE has waterproofed several heritage structure with approval from the relevant conservation authorities, by waterproofing the backfill rather than the structure, therefore not materially altering the orginal structure.
Low-pressure injection can waterproof specific areas, for instance only the brick rings, or a backfill. Also, the good chemical resistance of acrylic resin helps protect the structure against road salts.
Medium pressure injection is used for the injection of PUs into brickwork, the material bonds the masonry together as well as waterproofing the structure.
- Waterproofs within the brick
- Waterproofs backfill
- Setting time totally controllable
- Can work in conjunction with water management, e.g. weepholes
- Use of low pressure allows saturation of a structure
- Good chemical resistance
- Retains appearance of existing structure
- All quantities can be measured and recorded
- All work from below or above
- Brick culverts
- All multi-ring brick structures
Related information & Products
- Can be used in conjunction with a low-pressure waterproof system – see Masonry Waterproofing.
- Can be used as a concrete or cast iron water proofing system
- Acrylics Resin > TamAcryl 2000
- Polyurethane > TamPur 130, TamPur 150
Previous Site Environments
- Confined spaces
- Over a water course with EA approval
- Working from rafts moored under a bridge
- Tunnel under a working road
- Variety of road bridges from below
- Unrestricted traffic
- Potable water certified
- Flexible to semi-flexible.
Health & Safety / Environmental
- No special PPE Required
- No specific storage or containment required
Application Conditions & Limitations
- The acrylic resins have permanent open times until an accelerator is added, giving maximum flexibility.
- Polyurethane is injected at the same time as the catalyst, and will set in minutes (or seconds), depending on the amount of catalyst added.
- All the acrylic and polyurethanes are affected by low temperatures, which usually slow down the reaction time.
- Any structure showing missing pointing or cracking is likely to require either surface repair or waterproofing with the thicker polyurethane to avoid the acrylic resin running out.
- Acrylic has no structural strength, which means it can surround services, while being able to be easily dug out by hand with backfill if required
- Summersbury Road Bridge, Surrey Council
- Kingsway Service Tunnel, Camden Council
- Waveley Road bridge, Barnet Council
- Baynards Road bridge, Surrey Council
- Hale Lane bridge, Barnet Council
- Charing Cross Service Tunnel, Camden Council
- Mill Lane Rd Bridge, Surrey Council
- Addlestrop Cattle Creep, Dyer & Butler, Network Rail
- White Cross Subway, Dyer & Butler, Network Rail
- Fairlee Tunnel, Newport, Isle of Wight, Island Roads
- Walshaw Dean Upper Reservoir, JN Bentley, Yorkshire Water
- Clarkson Hill Rd Bridge, Lancashire County Council