1. SUBJECT
Styrobet and Isobet are insulating mortars which are used as a thermal insulating substrate for floors.
The layer of mortar is applied to the supporting floor (for example, concrete, wood, ...) as a substrate for the top floor. It can also serve as a filling and levelling layer for pipes and height differences.
Styrobet and Isobet are intended for use within buildings with a total load of < 6 kN/m² (houses, offices, rest homes, ...). Styrobet and Isobet can be used for both new buildings and renovation projects.
Onto the insulating substrate a load distributing layer must be laid, for example, a sand-cement top floor.
2. MATERIALS
Styrobet and Isobet are mortars with light, insulating fillers which are prepared at the building site in a suitable mixing machine.
Styrobet is supplied inclusive of the required binding agent, cement.
Isobet is supplied without the binding agent cement; this must still be added at the building site.
The mortars Styrobet and Isobet are 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:
- Styrobet: CEM I 42,5 or CEM 152,5 (approximately 250 kg/m3)
- 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)
2.1 Styrobet
Styrobet is supplied in bags of approximately 63 litres (insulating granulates + ancillary materials + cement are pre-mixed). Per bag approximately 13 litres of water must added at the building site.
Styrobet can also be delivered on site by special MaxiMixers.
Properties | Determination method | Result |
Mass by volume |
|
|
Compression load at breaking point | EN 826 | > 600 kPa |
Compressive strenght | NBN B14-209 | > 0,6 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 | 0,10 W/m.K |
Fire reaction | NBN S21-203 | A1 |
Distortion at distributed load and increased temperature |
|
|
2.2 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 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 |
|
|
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 bags
The storage period given below only applies for the products in unopened packaging. The storage period amounts to 6 months for Styrobet and 12 months for Isobet, and this in a dry and frost-free area.
The mortars are supplied in bags of approximately 17 kg (63 litres) for Styrobet and 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 Styrobet are supplied on pallets covered with plastic; the Isobet is 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 BBRI.3.3 Preparation
- Styrobet is supplied in bags of approximately 63 litres (insulating granulates + ancillary materials + cement have been pre-mixed). Per bag approximately 13 litres of water must be added at the building site.
- 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.
Styrobet and 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 (mixing time depends on the volume and is shown on the job documentation) and until the entire mixing vehicle is empty.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 TV 193 of the BBRI.Dilatation joints in the supporting structure must be pulled further through the mortar.
3.5 Laying of the finishing layers onto the Styrobet and Isobet mortars
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 BBRI.
The following finishing layers belong to the current applications:3.5.1. Cement-bound top floor
After the insulating mortar has fully dried, in order to prevent the top floor from drying too fast a foil or primer must be applied to the insulating underlay.
A minimum thickness of 5 cm must be observed for the top floor, in order to obtain sufficient load distribution.3.5.2. Dry top floor
For this please consult the manufacturer of the dry top floor, and follow his instructions to the letter.3.5.3. Tiling in a mortar bed
Tiles must be used the manufacturer of which allows them to be placed into a mortar bed. If stone is used, the resulting specific requirements must be taken into account.