Best Loft Insulation

For Pitched Roof Loft Conversions

Because the building regulations are so strict on the U-values that roofs have to meet using the most efficient insulation material is essential.

As a note it should be stated that the U-value of the roof must be 0.20 W/m2k.

In recent years the process involved in insulating pitched roofs has changed in that creating a ‘warm roof’ is now sometimes used.

A warm roof is created by installing the insulation material above the rafters. This allows extra thickness and creates a kind of insulated shell.

But often a warm roof isn’t practical or required and the insulation material can alternatively be placed below or between the rafters.

Sometimes circumstances dictate that a mixture of the two kinds of rafter insulation is used.

The disadvantage with having to install the insulation below the rafters is of course that the available headroom will be reduced.

The roof space will be further reduced by the need to include a vapour control layer to prevent condensation.

There are also some issues with placing the insulation boards between the rafters the major one being that a 50mm gap for ventilation must be left above the insulation material. The common solution is to use between and below insulation.

Probably the most difficult question to answer when looking at the best loft insulation for loft conversions is ‘how thick does the insulation need to be’?

The usual answer was always around 150mm but different building control officers will have different interpretations but most are open to being convinced that a lesser amount can sometimes be used.

This allows the 50mm loft conversion ventilation gap to be left along with the bulk of the insulation being fitted between the rafters with perhaps just 50mm below the rafters.

These boards have a remarkable 0.017 heat conductivity value which makes it the most efficient material available. Not only that but the foil facing acts as a vapour control layer making them much more space efficient than other materials.

For more info see the related pages below or complete the form at the bottom of the page for a free no obligation quote from tradesmen near you...

How To Install The Best Loft Insulation

Loft Insulation - An Overview

Loft Stairs

Loft Conversion Guide

Loft Conversion Ideas

Loft Conversion Prices

Loft Conversion Building Regulations

Loft Conversion