Cromar Trowel Mastic
- Suitable For: repairing roofing and building materials
- Area of use: EXT
- Application Method: trowel
- Volume: 1L, 2.5L, 5L, 25L
- Container Type: tin
- Type: adhesive
- Colour: black
- Brand: Cromar
- Manufactuer: Cromar
- Box Size: 1
Trowel Mastic is a heavy-bodied bituminous mastic designed for filling joints, cracks, and splits in roofing and building materials such as roofing felt, asphalt, concrete, asbestos cement, and metallic guttering and drainpipes. It provides immediate resistance to water penetration after application, making it ideal for maintenance and remedial work.
Key Points:
- Heavy-bodied bituminous mastic used for filling joints, cracks, and splits.
- Suitable for various materials including roofing felt, asphalt, concrete, asbestos cement, and metal guttering.
- Immediate water resistance upon application.
- Ideal for maintenance and remedial work.
For more in our range of bitumens, please click here. To shop our full Cromar range, click here.
Alternatively you can visit the Cromar website by clicking here.
Trowel Mastic is used to fill joints, cracks, and splits in roofing and building materials, including roofing felt, asphalt, concrete, asbestos cement, and metal guttering and drainpipes.
Preparation:
Ensure the surface is clean, dry, and free from oil, grease, dirt, and organic growth. Use Fungicidal Wash to remove moss and lichen. Wire brush bolt heads on roof sheets to remove rust before sealing with Trowel Mastic. For porous surfaces, apply Bituminous Primer to seal the surface and allow it to dry completely.
Method of Application:
To aid application, tools can be lubricated with white spirit or paraffin. Apply Trowel Mastic using a trowel or putty knife, pressing it into cracks and joints and smoothing it out. For cracks or joints larger than 3mm, reinforce with glass fibre scrim and apply a second layer of mastic.
Cleaning Tools:
Clean tools with White Spirit.
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| Elementlength | |||||||
| up to 1,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
|
| Type of window frame material |
Minimum witdth of joints for a butled mounting b in mm |
Minimum witdth of joints for a inner mounting b in mm |
|||||
| Hard PVC (white) | 10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Hard PVC and PMMA (dark) (colour extruded) |
15 | 20 | 25 | 30 | 10 | 15 | 20 |
| Hard PUR integral foam | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Wood-aluminium-window | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (bright) |
10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (dark) |
10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Wooden window frame | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
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