1. Insulating ‘Pirotherm’ sloping layer for flat roofs (new building)

On the cleaned supporting floor a layer of Pirotherm, insulating mortar, is sprayed and spread to a thickness of 1 to 2 cm. Into this mortar bed insulation panels are pressed. These panels are of PUR in the dimensions 40 x 120 cm or EPS in the dimensions 33 x 100 cm. PUR panels are placed at the water drains and farther away EPS panels. The thickness of the panels is calculated according to the required slope. These panels are laid at a distance of 3 to 5 cm from each other and jointed with Pirotherm insulating mortar, onto which a layer of Pirotherm insulating mortar of at least 4 cm thick is spread over the entire surface area. At the raised edges the corners can be slanted with the same mortar. The mortar is sufficiently levelled to allow the water sealing to be applied directly onto the insulation layer. After a setting time of 3 to 10 days, depending on temperature and humidity, the water sealing can be placed.

The ‘Pirotherm’ insulating mortar consists of a mixture of expanded vermiculite, perlite and pure recycled EPS granules of 1 to 4 mm, fibres and additives with cement as a binding agent. The Pirotherm insulating mortar, is mixed by means of a power mixer and pumped on site while excluding screed air conveyance in order to safeguard the granules’ insulating value.

The minimum thickness of the insulation layer must amount to ..... cm and the slope to ..... cm/m. The average thickness must be ..... cm in order to obtain an average practical U-value of ..... m²K/W (please refer to table).

The described insulation system carries a valid technical BUtgb (ATG 1699) approval for the sloping and insulating of flat roofs and profiled fibre-cement panels.

2. Renovation on an existing water sealing using Pirotherm

The existing water sealing is cleaned, large tears are filled and possible large blisters are cu open and seared. The existing water sealing is pre-processed with a special primer, which offers a high resistance against saponification in an alkaline environment. Onto this a layer of Pirotherm insulating mortar is sprayed. In this mortar layer insulation panels can be embedded, in order to obtain an improved thermal insulation. The PUR panels, dim. 40x120 cm, or EPS panels, dim. 33x100 cm, with a thickness calculated according to the required slope, are laid with a joint of 3 to 5 cm being left open between the panels. These joints are filled with insulating mortar. Furthermore, a layer of insulating mortar of at least 4 cm thick is spread over the entire surface area.

At the raised edges the corners can be slanted with the same mortar. The mortar is sufficiently levelled to allow the water sealing to be applied directly onto the insulation layer. After a setting time of 3 to 10 days, depending on temperature and humidity, the water sealing can be placed.

The ‘Pirotherm’ insulating mortar consists of a mixture of expanded vermiculite, perlite and pure recycled EPS granules of 1 to 4 mm, fibres and additives with cement as a binding agent. The Pirotherm insulating mortar, is mixed by means of a power mixer and pumped on site while excluding screed air conveyance in order to safeguard the granules’ insulating value.

The minimum thickness of the insulation layer must amount to ..... cm and the slope to ..... cm/m. The average thickness must be ..... cm in order to obtain an average practical U-value of ..... m²K/W (please refer to table).

The described insulation system carries a valid technical BUtgb (ATG 1699) approval for the sloping and insulating of flat roofs and profiled fibre-cement panels.

Technical properties regarding 1 and 2 :

a. Pirotherm insulating mortar

• Thermal conductivity ? : 0.09 W/mK (dry) – 0.13 W/mK (practical)
• Density : + 350 kg/m³ (dry)
• Compression strength: > 0,8 N/mm²
• Linear coefficient of expansion: 8 to 11.10^-6/K
• Vapour diffusion resistance figure µ: 7.5 to 11
• Fire resistance: A1 (NBN S 21-203) - MO (NF P 92-507) - class 1 (BS 476 part 7)

b. PUR panels

• Thermal conductivity ? : 0.030 W/mK
• Weight by volume: > 28 kg/m³

c. EPS panels

• Thermal conductivity ? : 0,040 W/mK
• Weight by volume:
  20 kg/m³ (thickness 2 – 3 – 4 cm)
  15 kg/m³ (thickness > 5 cm)

d. Pirotherm – flat roof system

• Mechanical strength at divided load Pirotherm + EPS panels according to EUtgb: class D
• Weight combination insulation panels + light Pirotherm mortar: approx. 25 to 45 kg/m²
• Table: approximate k-value of a roof with Pirotherm system: