Sika® C-250 Spray
Polyurethane spray applied insulation adhesive for Sarnafil® roofing systems
Sika® C-250 Spray is a 1-part, polyurethane based, moisture‐curing, spray applied insulation adhesive in a pressurised canister system.
- Quick adhesive application using pressurised canister and spray gun
- Adheres to solid, rough and clean surfaces
Usage
- Sprayable adhesive to bond suitable thermal insulation boards to specific substrates
Advantages
- Quick adhesive application using pressurised canister and spray gun
- Adheres to solid, rough and clean surfaces
Packaging
| Packaging unit | Single canister 23,7 kg (adhesive 17,6 kg) |
| Packaging dimensions | Cardboard box 320 mm × 320 mm × 460 mm |
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Refer to current price list for packaging variations
Colour
| Colour | green |
Product Details
Chemical Base
Polyurethane moisture‐curing
Shelf Life
12 months from date of production
Storage Conditions
The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +25 °C. Always refer to packaging.
Consistency
Foaming liquid
Compatibility
SUITABLE INSULATIONS
- SarnaTherm G/PIR insulation boards with lamination (glass or mineral fibre fleece)
- Mineral fibre boards with sufficient compressive strength and appropriate surface bonding
SUITABLE SUBSTRATES
- Sarnavap 5000E SA vapour control layer
- Mineral or sand‐surfaced/aged bitumen
- Sika® Primer 610 may be required on certain substrates
Application
Ambient Air Temperature
At least +5 °C
Substrate Temperature
At least +5 °C
Open Time
(+20 °C) 1‐4 minutes
Curing Time
(+20 °C) 15 minutes
Consumption
~130–260 g/m2.
Adhesive bead widths ~30 mm
Adhesive bead spacing: ~250 mm in the central zone. ~165 mm in the perimeter zone.
One single canister covers ~140 m2 applied in the central zone.
These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level or wastage etc.
SUBSTRATE QUALITY
The supporting structure must be of sufficient structural strength to apply all new and existing layers of the roof build-up. Complete roof system must be designed and secured against wind uplift loadings.
The substrates must be solvent resistant, uniform, firm, clean, dry, free of grease, bitumen, oil, dust and loosely adhering particles.
SUBSTRATE PREPARATION
Use the appropriate preparation equipment to achieve the required substrate quality
APPLICATION
Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.
Canister and spray-gun set-up
It is important to set‐up the Sika® C-250 Spray canister adhesive correctly before use to ensure the best possible performance and to avoid leakage or system failure.
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| 1. Remove the black cap from the canister valve. |
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| 2. Attach the braided‐hose to the canister valve (using the small nut) and attach the other end of the braided‐hose to the spray‐gun (using the large nut). Tighten with a spanner. |
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| 3. Attach the other end of the braided‐hose to the spray‐gun (using the large nut). Tighten with a spanner. If there is a spray tip fitted, remove, as it is not to be used with Sika® C-250 Spray |
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| 4. Fully open the valve on the canister |
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| 5. Pull the trigger on the spray‐gun to apply adhesive. |
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| 6. Adjust the flow and pressure by turning the black valve on the spray-gun anti‐clockwise until a foam bead of ~30mm in |
The pressure and flow of the adhesive is controlled by the black valve on the spray gun (see fig 6).
The distance of the spray gun from the substrate will need to be adjusted accordingly.
The end of the spray gun will require cleaning at intervals to maintain consistency of bead profile.
Central zones
Spray 4 continuous beads of adhesive per metre (250 mm centres) in parallel straight lines with a foam bead width of ~30 mm (130 g/m2).
Perimeter zones
Spray 6 continuous beads of adhesive per metre (166 mm centres) with a foam bead width of ~30 mm (195 g/m2).
Insulation board application
Do not apply more adhesive than can be covered in 5 minutes. The insulation boards or vapour control layer must be laid and pressed into the adhesive immediately after spray application. When bonding insulation boards, it is recommended that periodic checks are carried out to ensure the adhesive beads have been squeezed flat. Do this by gently lifting the insulation board at the leading edge. This is especially important on very uneven substrates.
CLEANING OF TOOLS
Tools and equipment must be cleaned with Sika® Spray Cleaner or Sarna Cleaner immediately after use. The hose and application gun can be cleaned with the flush adaptor and Sika® Spray Cleaner.