Why Is Fibreglass a Good Insulator?

Fibreglass insulation is an excellent insulator. Glass fibre insulation typically has a thermal value between 0.032 W/mK and 0.044 W/mK. It owes its excellent thermal properties to the materials and manufacturing process. Fibreglass wool insulation contains layers and layers of materials that are poor conductors of heat.

Is Glass Wool Insulation Fireproof?

In terms of thermal and acoustic insulation, glass mineral wool meets ever-more testing demands and regulations easily. In terms of fire protection, glass mineral wool products have been given a Reaction to Fire A1 (non-combustible) when tested to BS EN 13501-1 – the highest possible rating.All the products in the Knauf DriTherm range have a Euroclass rating of A1, which means that they are non-combustible and fire-resistant. The Euroclass rating was created to standardise the classification of insulation products across Europe. It is very reliable. Insulation materials undergo up to five tests to assess whether or not they are given an A1 (non-combustible) or F (combustible) rating.

Is Glass Wool Insulation Waterproof?

Unfortunately, glass wool insulation is not waterproof. Insulation boards are comprised of a core insulation material that is faced with two protective layers of aluminium foil. In contrast, fibreglass batts and rolls are exposed. There is no protective layer between water and the insulating material.Fibreglass insulation works best in environments that are protected from moisture. If fibreglass or glass wool gets wet, moisture will saturate the material and make it ineffective. You might be able to save the roll if you can dry it out and remove the moisture, but fibreglass insulation should be kept dry if at all possible.

How to Cut Fibreglass Insulation?

Fibreglass insulation is lightweight and one of the easiest insulation materials (compared to other building materials) to cut and manipulate into different shapes. Some fibreglass insulation rolls are pre-perforated, which means that you can get the size you need without making any cuts. If you do need to cut your glass wool insulation, the easiest way to go about it is with a sharp utility knife. We recommend marking the rolls or batts with your measurements before cutting and wearing protective gear (we suggest that you wear gloves and eye protection).

Is Fibreglass Insulation Safe?

Some people are reluctant to cut fibreglass because they think that the particles are dangerous when they are airborne. Fibreglass insulation is only ever dangerous to human health when it is wet. When the insulation is wet it develops mildew, which can be hazardous to people who have breathing problems like asthma. When laying fibreglass insulation types, you should always lay it with a vapour barrier or ensure there is vent space to stop moisture build-up.Some people look to use spray foam insulation over fibreglass insulation. If you want to use spray foam insulation, it's best to seek professional advice.

Fibreglass Insulation (Glass Wool)

170mm Knauf Loft Roll 44 Insulation Combi-Cut - Pallet of 24 Rolls (192.34m2/Pallet)

BULK SAVING

Fibreglass Insulation

170mm Knauf Loft Roll 44 Insulation Combi-Cut - Pallet of 24 Rolls (192.34m2/Pallet)

150mm Knauf DriTherm Cavity Wall Insulation Slab 37 (4.37m2/Pack)

100mm Knauf DriTherm Cavity Wall Insulation Slab 32 - Pallet of 30 Packs (98.4m2/Pallet)

50mm Knauf Acoustic (APR) Insulation Roll - Pallet of 24 Rolls (388.8m2/Pallet)

140mm Knauf Frametherm Roll 32 (3.19m2/Roll)

75mm Isover RD Party Wall Insulation Roll (7.74m2/Roll)

140mm Knauf Frametherm Roll 35 (4.45m2/Roll)

75mm Knauf Acoustic (APR) Insulation Roll - Pallet of 24 Rolls (417.6m2/Pallet)

90mm Knauf Frametherm Roll 32 (5.13m2/Roll)

125mm Knauf DriTherm Cavity Wall Insulation Slab 32 (2.18m2/Pack)

140mm Knauf Frametherm Roll 40 (9.14m2/Roll)

100mm Isover RD Party Wall Insulation Roll (5.46m2/Roll)

75mm Knauf DriTherm Cavity Wall Insulation Slab 32 (3.28m2/Pack)

85mm Knauf DriTherm Cavity Wall Insulation Slab 37 (4.37m2/Pack)

65mm Knauf DriTherm Cavity Wall Insulation Slab 37 (5.46m2/Pack)

125mm Knauf DriTherm Cavity Wall Insulation Slab 37 (3.28m2/Pack)

90mm Knauf Frametherm Roll 40 (14.25m2/Roll)

90mm Knauf Frametherm Roll 35 (6.84m2/Roll)

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