## How do you find the U-value of a ground floor?

This is calculated by dividing the exposed perimeter given by the floor area.

- Measuring the Perimeter. Floor dimensions should be measured between the finished internal surfaces of the external walls.
- Type of floor.
- U-value.

**How much insulation do I need in my floor?**

To achieve this standard, you will normally need at least 70mm of high-performance foam insulation, or 150mm of mineral wool, but this will vary depending on floor type, shape and size. If you are replacing at least half of a floor then you have to insulate to these standards whether you planned to or not.

### What U value do I need for building regs?

The best insulating materials have a U-value of close to zero – the lower the better. Building regulations currently stipulate that for a new building, the elements must have maximum U-values as follows: Wall – 0.3 W/m2k. Roof – 0.15 W/m2k.

**What U value is building regulations?**

A U-value is a measure of heat loss in a building element such as a wall, floor or roof. It can also be referred to as an ‘overall heat transfer co-efficient’ and measures how well parts of a building transfer heat. This means that the higher the U-value the worse the thermal performance of the building envelope.

#### Does concrete have a high U-value?

“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….U-Values for common materials.

Cold Mass Specific Gravity | |
---|---|

Material | Specific Gravity |

Cast Iron | 0.11 |

Cement | 0.19 |

Concrete (140# / ft3) | 0.16 |

**What U-value do I need for building regs?**

## What type of insulation is best for floors?

Insulations boards or EPS sheets are a material that is an expanded polystyrene sheet. It is one of the best-known floor insulation materials because EPS sheets are easy to install and have a high insulation value.

**Is 0.16 a good U-value?**

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 (opens in new tab) require a wall of no worse than 0.3, roof 0.16, and ground floor 0.22.

### How do you calculate the U value of a ground floor?

Unlike roofs, walls and intermediate floors, U–value calculations for ground floors cannot be calculated with reference to the construction detail alone. Heat loss from ground floors depends upon a number of factors including the ratio of the exposed floor perimeter to the total floor area.

**What is the UU value of a heated floor?**

U = U-Value of the uninsulated floor (W/m²K). P = Length of the exposed perimeter (m). The measurement of the perimeter and area should be to the inside surface of the perimeter walls that enclose the heated space. Unheated spaces such as garages and porches etc. should be excluded.

#### What U-value is required from a ground floor construction?

WHAT U-VALUE IS REQUIRED FROM A GROUND FLOOR CONSTRUCTION? Due to the nature of energy efficiency regulations across the UK, it is impossible to state a definitive U-value that any single ground floor construction should achieve.

**What is the U-value of an uninsulated floor?**

Recent changes to the building regulations have reduced the stipulated U-Value for floors from 0.45 to 0.25 W/m²K. The formula for calculation of a ground floor U-Value is given in CIBSE Guide A3 and is very complicated. A simplified method of calculating the U-Value of an uninsulated floor has been described in BRE Information Paper IP 3/90.