HYDRONYLON® HP
Base layers of the system on felt substrates, reinforced with Technical Mesh SW-1 and always finished with HYDRONYLON HN.
Prices
| Pack | Retail price |
|---|---|
| 25 kg | £224.00 (£8.96/kg) |
HYDRONYLON Approved Contractors buy at preferential trade rates.
HYDRONYLON LTD is not currently registered for VAT, so no VAT is charged - the prices shown are the final prices payable.
Where it fits in the system
HYDRONYLON HP forms the reinforced base of the system on felt roofs. It is applied in a minimum of two coats, with Technical Mesh SW-1 embedded into the second coat. It is never used on its own: the build-up is always completed with the HYDRONYLON HN top coat.
How the system worksTechnical parameters
| Role in the system | Base layers on felt substrates |
|---|---|
| Colour | Grey |
| Pack size | 25 kg |
| Consumption, first coat | Approx. 0.8 kg/m² (1.0 kg/m² on new coarse-grained felt) |
| Consumption, second coat | Approx. 1.2 kg/m², applied through Technical Mesh SW-1 |
| Total consumption | Min. 2.0 kg/m² (min. 2.2 kg/m² on new coarse-grained felt) |
| Number of coats | Min. 2 |
| Interval between coats | Min. 24 h |
| Application conditions | +10°C to +35°C around the clock, relative humidity up to 85% |
| Storage | +5°C to +30°C; use within 30 days of opening |
System performance (ETA-23/0735)
| External fire performance | B(roof)(t1) |
|---|---|
| Reaction to fire | Class E |
| Watertightness | Watertight |
| Wind load resistance | Pass (> 50 kPa) |
| Working life category | W2 (10 years) |
| User load category | P3 (Normal) |
| Roof slopes | S1 to S4 |
| Surface temperature range | -20°C (TL3) to +80°C (TH3) |
| Minimum dry film thickness | Felt 1.8 mm, metal 0.7 mm, mineral 0.75 mm, PVC 1.2 mm |
| Notified Body | No. 1454 (Łukasiewicz - Warsaw Institute of Technology) |
Coverage
- Total consumption on felt is a minimum of 2.0 kg/m² across two coats, rising to a minimum of 2.2 kg/m² on new coarse-grained felt.
- Example: a 50 m² felt roof needs at least 100 kg of HYDRONYLON HP, which is four 25 kg buckets. On new coarse-grained felt allow at least 110 kg, which is five buckets.
- Complete felt build-up materials cost: £34.89/m² (materials only; HYDRONYLON HP 2 kg, HYDRONYLON HN 1 kg and Technical Mesh SW-1 1.05 m² per m²).
Application notes
- Apply at +10°C to +35°C around the clock, at relative humidity up to 85%; never on wet or frozen substrates or during rainfall.
- Apply a minimum of two coats: the first at approx. 0.8 kg/m² (1.0 kg/m² on new coarse-grained felt), the second at approx. 1.2 kg/m² through Technical Mesh SW-1 with overlaps of at least 10 cm.
- Allow a minimum of 24 h between coats.
- HYDRONYLON HP is never used as a standalone finish: always complete the build-up with the HYDRONYLON HN top coat.
- Mix before use and do not dilute. Clean tools with warm water and detergent.
Downloads
Frequently asked questions
Can HYDRONYLON HP be used on its own?
No. HYDRONYLON HP forms the reinforced base of the build-up on felt and is always finished with the HYDRONYLON HN top coat, which provides the final weathering surface of the system.
How much HYDRONYLON HP do I need?
Plan for a minimum of 2.0 kg/m² across two coats, or a minimum of 2.2 kg/m² on new coarse-grained felt. For a 50 m² felt roof that means at least 100 kg, which is four 25 kg buckets.
How long should I wait between coats?
Allow a minimum of 24 hours between coats. Apply only at temperatures between +10°C and +35°C around the clock, at relative humidity up to 85%, and never on wet or frozen substrates or during rainfall.