1. SUBJECT
Isobet is an insulating mortar which is used as a thermal insulating underlay for floors. On top of this levelling layer a Thermofloor Silence acoustic insulating foil is laid. This combination is known as Isobet-Plus.
On to this insulating layer a load distributing layer must be laid, for example, a reinforced sand-cement top floor or a self-levelling top floor.
2. MATERIALS
2.1. Isobet
Isobet is a mortar with light, insulating fillers which are prepared at the building site in a suitable mixing machine.
Isobet is supplied without the binding agent cement; this must still be added at the building site.
The mortar Isobet is composed of the following raw materials:
- insulating granulates
- expanded recycled polystyrene granules (Æ 2 to 4 mm)
- expanded vermiculite (Æ to 3 mm) - dry ancillary materials to obtain thixotropic properties and a good workability cement (CE approved) as a binding agent:
Isobet: cement (CEM 132,5; CEM I 42,5 or CEM 152,5) must still be added at
the building site (25 kg per bag of Isobet)
Isobet can also be delivered on site by special MaxiMixers.
Properties | Determination method | Result |
Mass by volume |
|
|
Compression load at breaking point | EN 826 | > 200 kPa |
Compressive strenght | NBN B14-209 | > 0,3 N/mm² |
Point load (Æ 80 mm) | EN 12430 | > 500 kPa |
Wisselende belasting (15.000 cycli van 2 tot 6 kN/m²) | BBRI TV 189 §8.2.3 | < 0,05 mm |
Lambda-value (design value) | NBN B62-203 | 0,085 W/m.K |
Fire reaction | NBN S21-203 | A1 |
Distortion at distributed load and increased temperature |
|
|
2.2. Thermofloor Silence
Thermofloor Silence is a canalised expanded polystyrene foam fitted with a metallized PET film.
Thermofloor Silence ensures a very good contact-sound insulation between the supporting structure and the finished floor.
- Impervious to moisture and mould.
- Easy application and cutting.
- Raised edges (10 cm) are easily realized thanks to a special skirting insulation.
- Very high mechanical strength.
- 100 % CFC-free material.
- Density: 15 to 20 kg/m³
- EPS foam: fire retarding quality
- Temperature resistance: -30 to +70 °C
- Thermal conductivity: 0.036 W/m.K
- Sound transmission of contact sound – W.T.C.B. (in combination with Isobet)
NBN S01-400 – Category Ia
AND – ISO 717 – Improvement index ?Lw = 27 (dB)
- Foil
9 rolls packaged in PE on non-deposit pallet
Per roll: length: 20.83 m
width: 1.2 m
thickness: 6.5 mm - Skirting
45 rolls on non-deposit pallet
Per roll: length: 20 m
width: 0.24 m
thickness: 6.5 mm (double-sided lamination)
3. PROCESSING
The installation is not subject to a check by Pirobouw and is carried out according to the directions for use on the packaging at the installer’s responsibility. The installer will respect the rules for good practice. 3.1 Storage in bagsThe storage period given below only applies for the products in unopened packaging. The storage period amounts to 12 months for Isobet, and this in a dry and frost-free area.
The mortars are supplied in bags of approximately 3 kg (130 litres) for Isobet. On the bags the necessary information is provided that allows the product to be identified (brand name, processing instructions, shelf life, production date, production place, ...).The bags of Isobet are supplied in loose bags. 3.2 Conditions during the placing The ambient temperature and the temperature of the substrate must be at least +5 °C and not exceed +35 °C. Prior to starting the installation, one must verify that the surface of the substrate is free of grease and clean, that the substrate is sufficiently hard and dry, does not show any moving cracks or tears and meets the dimensional requirements as stated in TV 189 (Technical Information 189) of the B.B.R.I.
3.3 Preparation of Isobet
Isobet is supplied in bags of approximately 130 litres (insulating granulates + ancillary materials). Per bag approximately 24 litres of water and 25 kg of cement must be added at the building site.
Isobet must be mixed intensively and long enough (approximately 3 minutes) in a suitable mixer (concrete mixer, screed machine, . . .) in order to obtain a homogenous mixture. They must always be mixed per entire bag.In the event of delivery in mixer vehicles the necessary amount of water will be accurately metered. Mixing must be continued until a homogenous mixture is obtained
3.4 Application of the Styrobet and Isobet mortars onto the substrate
The insulating mortar must always be applied onto a stable substrate to a thickness of at least 30 mm.
Onto a wooden or woody substrate polyethylene foil must be fitted first, with an overlap of at least 10 cm or a welded overlap.
In the case of a cement-bound substrate which is not strongly water absorbing, the mortar will adhere to the cleaned substrate. In order to obtain a bond in the case of a very strongly water absorbing substrate (for example, dried out concrete), the substrate must be excessively moistened and brushed with cement.
In the event of application on foil, dilatation joints and edge joints are fitted in the mortar as from a surface area of 50 m2 and a length of over 8 m, such as stated in section 6 of TN 193 of the B.B.R.I.
Dilatation joints in the supporting structure must be pulled further through the mortar.
3.5 Laying the Thermofloor-Silence
The special skirting is placed up against the walls and around all vertical pipes and mechanically secured to the Isobet.
The foil is laid over the entire floor surface. The strips of foil overlap each other and the special skirting by at least 10 cm. The joints are sealed with tape.
3.6 Laying of the finishing layers onto Isobet-Plus
After 3 to 4 days the finishing layers can be laid onto the insulating underlay.
Prior to starting the laying of the finishing layer it must be verified that the insulating underlay meets the dimensional requirements as stated in section 4.2 of TV 189 of the B.B.R.I.
The following finishing layers belong to the current applications:3.6.1. Cement-bound top floor
A minimum thickness of 5 cm reinforced top floor must be laid in order to obtain sufficient load distribution.3.6.2. Dry top floor
For this please consult the manufacturer of the dry top floor, and follow his instructions to the letter.