Thermal insulation of the roof with sawdust, the features of such insulation, its advantages and disadvantages, the preparatory stage of work and the technology of laying the material. There are also drawbacks to thermal insulation with sawdust. First of all, this is the flammability of the starting material and its low resistance to the effects of fungus, insects and destruction by rodents. In addition, the thermal conductivity of wet sawdust increases several times, which leads to the need to use additional waterproofing materials in the work. To minimize the disadvantages of sawdust insulation, the raw materials are treated with antiseptics, fire retardants and other additives that give the thermal insulation coating special properties.
Roof preparation for insulation
Before insulating the roof with sawdust mixtures, the material and wooden structures of the attic should be prepared. It is necessary to apply antiseptic impregnation to the beams of rafters, ceilings and other elements of the roof structure, then use polyurethane foam to seal up all the cracks and joints in hard-to-reach places. All rotten and damaged wooden roof parts must be replaced.
At the same time, you can start drying sawdust, preferably in the fresh air under a canopy. This event will relieve the raw materials from mustiness. Then it is recommended to add copper sulfate and slaked lime to dry sawdust. These solutions will scare away mice and reduce the flammability of the insulation. Previously, broken glass and shredded tobacco were used for this.
Between the beams of the attic floor, it is necessary to lay thick paper or roofing felt before laying the sawdust mixture. The canvases of these materials must be overlapped with respect to each other, and the edges must be wound behind the beams, fixing them with staples using a stapler.
If water supply pipes and electrical wiring are located on the attic floor, it is necessary to check their integrity before insulation. The electrical wiring should be enclosed in special sleeves and the chimneys should be protected with fire-resistant material. In the future, all this will certainly help to avoid serious problems.
Sawdust stacking technology
Before insulating the roof with sawdust, you should prepare the components of any of the insulating mixtures described above, a bucket, water, a large mixing container, a hoe or a shovel.
The work must be done in this order:
- Install the timber plank formwork on the subfloor of the attic floor. Boards can be taken substandard or even do with a croaker.
- Knead a sawdust-based thermal insulation compound in a container, and then pour it onto the sub-floor covered with a waterproofing material, creating a layer 8-25 cm thick, depending on the components used and the load-bearing capacity of the floor.
- Align the surface of the insulation using the rule and leave it to dry completely.
- After 2-3 weeks, lay another layer of waterproofing on top of the hardened coating and fix the edges of the material on the wooden floor logs.
- Attach a plank flooring, thick plywood or chipboard to the logs with self-tapping screws. They will be the basis for finishing the attic floor.
When insulating the roof slopes, you first need to create cavities for filling the insulation. A dry mixture of sawdust and lime must be placed between the waterproofing protection and the inner lining of the roof using the technology of insulating frame-panel walls. The backfill layer thickness should be 20-30 cm.
How to insulate the roof with sawdust - watch the video:
[media = https://www.youtube.com/watch? v = 9MkFisA6YkU] Thermal insulation of the roof with sawdust gives good results and is quite within the power of even an inexperienced owner in the construction business. If the insulating composition was correctly made and the technology of its installation was observed, you can enjoy the comfort in a house with a warm attic for more than a dozen years.
