Table of contents:
Video: Roof expansion: clever heat storage
Little attention was paid to this in the past. Today it is even anchored in the EnEV under the heading "Summer heat protection".
The amount of heat that a material swallows cannot heat the room any further on summer afternoons. The heat is released to the room with a delay at night. Experts then speak of amplitude damping. Example: mineral wool, 12 cm thick, 25 kg / m3 heavy, can store 2.5 to 3.0 kJ / (m2K). Wood fiber insulation boards of the same thickness absorb 66 kJ - twenty times more. But mineral wool can insulate heat much better.
Cut mineral fiber mats about 1 to 2 cm wider: so nestle
they cling to oblique rafters
nevertheless in the space. Every fugue
stuff. Foil overlap all over, with special
Adhesives or tapes airtight
No material can do everything equally well. That is why you use different, in several layers, each material where it can develop its properties optimally: particularly heat-storing, heavy material on the room side, super insulating and water-repellent on the outside. Craftsmen, energy consultants and architects know how best to do this and what U-value comes out of it. Craftsmen always have to calculate this precisely: The EnEV stipulates that they have to confirm without being asked and in writing that the work complies with the valid EnEV. Experts also work at hourly rates. An architect can also give advice on design and statics when it comes to energy advice: how it gets lighter under the roof, where it's best to install windows and cladding, whether you can tear away walls for
more spacious living.
Battens: Where the tacker wires pierce the film: mask. Screw the battens across. Cables can be laid on this level.
More light keeps rooms going, colors shine more brilliantly, plants grow more splendidly. In the past there were only dormers - they give head height, but light from above illuminates five and a half times more effectively than side light. The Dane Rasmussen invented the roof window in 1941 and industrialized its manufacture. Usual installation height: window edge above at about two meters; Lower edge ninety centimeters above the floor, or fixed glazing of the knee stick as fall protection. Screens, blinds and roller shutters serve as a barrier against too much light, roller blinds and folding blinds on the room side. New dormers cost significantly more money and work; a building permit is required. Insulating a dormer properly is a puzzle game that has many seams.
Gypsum dress: screw on gypsum fiber or gypsum plasterboard, fill in the joints, seal seams to walls, windows, etc. elastically.
Look closely at the wood of the structure before you insulate. Everything solid and healthy? No insect flight holes? No brown spots? Is the stiffening panicle still present in the rafter roof (recognizable by the arrangement of the rafters in pairs)? The wind panicle is a diagonal board or a metal band that sits inside the wood and keeps it at a distance. Since these boards are in the way when sloping, they were often removed due to a lack of knowledge. When the wind pressure is high, the pairs of rafters can move: you can see this from the outside when the ridge arches a “cat hump”. Complement the wind panicle or replace it with a metal band. A stable sub-roof, for example made of chipboard, serves the same purpose. It's best to ask the carpenter.
In this post you read:
- Modernization at the right time
- Clever heat storage
- Insulation materials
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