Mistakes to avoid when laying rock wool

Mistakes to avoid when laying rock wool

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Rock wool is widely used today due to its insulating capacity and low cost. However, to take advantage of the advantages of this flame-retardant mineral insulation for a long time, but also to protect your health, you must at all costs avoid certain errors when laying rock wool. In other words, prevention is better than cure. Especially since insulation installed despite common sense can lead to the occurrence of thermal bridges generating, in the more or less long term, excessive humidity. Here are some tips to insulate your home in a state of the art.

Mistake N ° 1: Remove the old insulation before laying the rock wool

Rock wool loses its insulating power after a few decades. But removing the old insulation when it is a rock wool to replace it with new rock wool is a shame. We can on the contrary be satisfied with laying a new layer by limiting its thickness, simply to supplement that already in place. This solution makes it possible to reduce the budget reserved for insulation.

Mistake 2: Compress the rock wool

It is harmful to compress semi-rigid rock wool. After installation, the insulation will resume its thickness which will have the effect of reducing the ventilated air space which it is essential to leave between the roofing and the under-roof screen. In these conditions, it may be very difficult to set up an under-roof screen. Finally, be aware that a compressed insulation traps less air. Thus its conductivity being increased, it loses its thermal resistance. To avoid having to compress rock wool, it is essential to cut it to exact dimensions.

Mistake N ° 3: Do not install a vapor barrier when insulating with rock wool

Associating a vapor barrier with rock wool is essential for quality insulation. It has been proven that mineral insulators such as rock wool or glass wool are extremely sensitive to water vapor which they are unable to regulate. To prevent rock wool from deteriorating, it is absolutely essential to prevent condensation from stagnating inside the mineral insulation. The only solution is to install, on the home side, a vapor barrier made of aluminum or kraft.

Mistake # 4: Not protecting yourself during insulation work

Although not classified as a carcinogen, rock wool could however represent health risks due to its unfavorable ecological balance. Let us not forget that this mineral insulation contains dust inhibitors and binders which can prove to be dangerous for the respiratory tract, the eyes, the skin. However, it is strongly recommended to protect yourself against possible health risks. When handling rock wool, the wisest course is to wear gloves, glasses and a protective mask as well as a coverall.