Guidelines for single-layer pitched roof thermal insulation using URSA® wool

Required tools and materials:
1. Insulation foils URSA® SECO 150
2. Insulation foils URSA® SECO 200
3. Two-sided sticking tape URSA® TOP DK
4. Caulking tape URSA® TOP U
5. Mineral glasswool insulation felts URSA® RF40/B1 "Good roof"
6. Plain aluminium tape
7. Mineral glasswool URSA® DF35 "Super house"
8. Mineral glasswool elastic felts URSA® SF40 "Steep roof"
9. Mineral glasswool insulation felts URSA® DF40 "Warm celling"
10. Mineral glasswool insulation panels URSA® FKP "Energy saving house"
11. Roof membranes URSA® SECO 1000 S
12. Roof membranes URSA® SECO 3000 S
13. Roof membranes URSA® SECO 4000 S

Guidelines for single-layer pitched roof thermal insulation using URSA® wool:

URSA® insulation felts: SF40, DF35, DF40, DF45

Step 1
Before applying thermal insulation to a pitched roof, the roof structure must be tightly protected against precipitation and wind—preferably, after the roofing has been laid.

Step 2
After unpacking URSA® insulation felts, wait several minutes until the wool expands to its nominal size.

Step 3
Using a sharp tool (e.g. the URSA® knife), on an even plank, cut off a strip of felt. The length of the strip must be equal to the inside distance between the rafters (where the felt is applied) plus 2cm excess necessary to keep the URSA® wool stuck in the space between the rafters and to fill any irregularities tightly.

Step 4
Insulating should begin from the bottom of the rafter, and each consecutive element should be closely butted against the previous one, which helps to avoid heat leakage bridges.

Step 5
To help protect the wool from slipping out, support it with thin, zinc-coated steel wire, stretched between nails driven from the bottom of the rafter (every 60–70cm). Cutting elements of a specific size helps to minimize the amount of wasted wool.

Step 6
When laying wool strips next to the required ventilation void (the recommended height is 2–4cm), it is especially important to leave an air duct. This can be done using delimiting timber battens or zinc-coated steel wire.

Step 7
For ventilation purposes, opens must be made at eaves and at the ridge or slopes (e.g. using ready-made roofing elements).

Step 8
On this thermal insulation, URSA® SECO 150 (200) insulation foil is stapled directly to the rafters. The laps between the foil sheets should be approximately 10cm long and tightly joined with the URSA®TOP-DK double-sided adhesive tape. The joints of the foil with the rafter plate, gable wall etc. are sealed with the URSA®TOP-U caulking tape and a retaining batten.

URSA® FKP Insulation Panels
The procedure is similar to the one with rolls, except 600 x 1,250mm panels are used for insulation.

URSA® RF 40/B1 Insulation Felt

Step 1
The distance between the rafters should be adjusted to the roll width already at the design stage (70, 80, 90, 100, 120cm). The rafter framing and rafter spacing must adhere to the design specifications (with +/- 5mm tolerance).

Step 2
A roll of the URSA® RF 40 / B1 wool is laid along rafters, from the roof ridge. The aluminium paper laminate should face the loft space. Either side of the roll has 50mm aluminium foil laps that are stapled to the rafters. To join the adjacent strips tightly, attach the URSA® Alu aluminium tape along the laps on the rafters. The solution based on the URSA® RF 40 / B1 wool has the following advantages: easy and quick installation, the roll is better secured to the rafters, the vapour barrier is installed together with the wool, the aluminium paper is also a thermal shield.