What is the U-value of Thermalite blocks?

Mean compressive strength 9.0N/mm2 * Design thermal conductivity (λ) 0.19W/m.K Design thermal conductivity below ground (λ) 0.31W/m.K Dry thermal conductivity value: (λ10,dry, unit) 0.17W/m.K Specified gross dry density 770kg/m3 Thermalite blocks require a moisture resistant finish or impervious cladding applied when …

What is a good U-value for windows?

Generally, the lower the U-Value of a window the better. Low U-Values indicate that a window will perform well in maintaining the indoor temperature of a customer’s home. Recently building regulations have changed, meaning that new windows must have a u-Value below 1.6 W/m2k.

What does the U-value mean in windows?

The U-Factor measures how well the window in- sulates. While the U-Factor can take any value, in general for windows it ranges from 0.20 to 1.20. The lower the U-Factor, the better the window insulates. The SHGC measures how much of the sun’s heat comes through the window. It can range in value from 0 to 1.

What is a good U-value?

In 2018, Part L building regulations for standard replacement doors and windows specified that a product should have a U-Value no higher than 1.6 for windows, and 1.8 for doors.

What are Thermalite blocks?

Thermalite blocks are made from aerated concrete so are light, easy to handle and workable – IE easy to cut. They are made of about 80% fuel ash (from burned coal) so are more sustainable than traditional concrete blocks.

Is lower or higher U-value better?

U-values measure how effective a material is an insulator. The lower the U-value is, the better the material is as a heat insulator. Very broadly, the better (i.e. lower) the U-value of a buildings fabric, the less energy is required to maintain comfortable conditions inside the building.

What U-value is needed?

To put that into context: a single-glazed window will have a U value of 5.0, a standard double-glazed window around 1.6 and triple glazed around 0.8. Building Regulations require a wall of no worse than 0.3, roof 0.16, and ground floor 0.22. All of these U values are written as W/m2K.

Is lower U-value better?

There is a relationship between U-value and R-value—they are mathematical reciprocals of each other. Thus, while lower U-values indicate better insulating performance, higher R-values indicate better thermal resistance.

What does U-value stand for?

Thermal transmittance, also known as U-value, is the rate of transfer of heat through a structure (which can be a single material or a composite), divided by the difference in temperature across that structure. The units of measurement are W/m²K. The better-insulated a structure is, the lower the U-value will be.

What are the different types of Thermalite blocks?

Thermalite Blocks

• 140mm Thermalite Hi-Strength Aircrete Block 7N 215mm x 440mm.
• 100mm Thermalite Shield Aircrete Block 3.6N 215mm x 440mm.
• 100mm Thermalite Hi-Strength Aircrete Block 7N 215mm x 440mm.
• 215mm Thermalite Hi-Strength Aircrete Block 7N 215mm x 440mm.
• 100mm Thermalite Turbo Aircrete Block 2.9N 215mm x 440mm.

What is the you value of a thermal coefficient?

“U” Value is the coefficient of transmission, i.e., the transmission of heat through the materials, which compose the building’s “envelope,” or outer shell. “U” Value has an inverse relationship to “R” Value. For example, a building with material with an “R” Value of R-11 converts to an “U” Value of 0.09…

What are the U-values for walls and floors?

In practice, lower u-values are aimed for to help the required % reduction in CO₂ from the SAP calculation be achieved easily. Currently for new build dwellings, walls tend to be 0.28 and below, floors 0.22 and below.

What are the U-values of thermal resistors?

U-values are calculated from the thermal resistances of the parts making up a particular part of the structure. Transmission of heat is opposed in varying amounts dependent on material and surface.

What is the U-value of air permeability for solid walls?

Furthermore, solid wall options (traditional blocks laid flat or solid Airtec blocks) allow a u-value of 0.00 W/m2K to be applied. The limiting value for air permeability has been set at 10 m³/hr/m² tested at 50 pascals, and the requirements for on-site air permeability testing has been increased over previous regulations.