Roof insulation for loft rafters

David Garcia

May 18, 2025

9 min read

Place the plastic sheeting on top of the rolled insulation.The alternative is called warm roof insulation.

The 8 Best Roof Insulation Types (2024 Guide)

In some countries granulate is also used to insulate . The best loft insulation material between rafters and joists will depend a lot on your budget, personal preferences, and the type of loft you are trying to have; a storage space or a living space.APPLICATION OVERVIEW. They are normally . This problem can usually be designed . Cut any larger width rolls (1140mm) to the desired width dependent on your joist’s spacing. She has an annual heating bill of €1,600. Take into account any obstacles such as vents, pipes, or ductwork that could affect the type of insulation material you choose. It is suitable for use all over the home, in pitched roof rafters, framed external walls, internal partitions, intermediate floors, separating walls and floors, and timber suspended ground floors. If you plan to store some heat-sensitive items or want to use the attic for your hobbies. It also makes buildings more environmentally friendly at a stroke. It will stop the heat escaping from the living area of your home, but leave the loft space uninsulated. This isn’t a DIY job, so you’ll need a .Which is cheaper, attic insulation or roof insulation? How long does roof insulation last? What is an air gap in roof installation? With this guide, learn more about .From steel, concrete or warm roofs to rafter line or loft insulation, ROCKWOOL products are made from premium stone wool to keep your properties safe and the indoor environment comfortable.One of the simplest and most effective ways to insulate a pitched roof is to fit Celotex between the roof rafters.

How to Insulate a Loft: A Step-by-Step Guide

The first step in insulating your attic roof rafters is to measure the space you have available. Firstly, it significantly enhances energy efficiency by reducing the need for heating and cooling, leading to lower utility bills.

Rafter Insulation

If the plastic sheeting is in pieces, overlap the pieces .

Loft Insulation: A Complete Guide

Then, feed the rolled insulation under wires and pipe, if either is present.

Loft Insulation Between Rafters : A Comprehensive Guide

or expect to pay closer to $2. ROCKWOOL rafter insulation helps to provide thermal, fire and acoustic protection for roof . These measurements will allow you to establish how much insulation board will be needed.

The Ultimate Guide to Loft and Roof Insulation

It’s a great insulation solution for both new build houses and .However, if the roof insulation is being added to an existing roof, for example as part of a loft conversion, then a cold roof is the most likely solution as you can’t insulate above the rafters.

Loft insulation

Compare Quotes and Look for Grants.Check out our round-up of the eight best types of roof insulation to gain a better understanding of your options for achieving optimal energy efficienc y.

How To Insulate Roof Rafters With Celotex

It costs around £930 to insulate loft rafters in a 3-bedroom semi-detached UK house. Increase the energy efficiency of a .Cons: no actual insulation value, most homeowners will choose to spend their money on other options. A form of rigid insulation, there are three main types PIR/PUR boards, Phenolic boards and EPS boards.Measure Your Attic Space. PIR insulation is readily available at DIY stores such as B&Q, Wickes, Selco, or Travis Perkins, making it a convenient option for . This video will also cover important considerat. Mary previously had 100mm of fibreglass insulation between her rafters but decided to upgrade the insulation in her attic to 100mm of a rigid foam insulation following consultation with Insulating a flat or pitched roof – or a loft – can help: Prevent heat loss.

In this video I show you as a DIYer how to cut and fit PIR (insulation) board between rafters. If you’re laying narrow, pre-cut rolls (370/380 or 570mm) or encapsulated insulation - jump to Step 2. Choosing the right type of insulation is pivotal. Hans_25 Screwfix Select.

How to Properly Insulate Your Attic Roof Rafters

(See ‘How to calculate the desired width of loft roll insulation’ for appropriate width sizes).

An alternative way to insulate your loft is to fit rigid insulation boards between and over the rafters. By keeping cold air outside and heating energy inside, it serves as an effective barrier for preventing cold air from entering a living space.Loft insulation rolls are usually 1140mm wide, so you’ll probably need to cut it to fit.Auteur : ROCKWOOLUK By keeping cold air outside and heating energy inside, it serves .Insulating joists vs insulating rafters. Roof insulation, done right, should pay for itself many times over in a 40-year lifespan. Sustainability – our insulation is designed to last for the lifetime of the building .Best loft insulation material for rafters vs joists. I show you the tools, the products and methods I use to carry .Rafter Insulation - using rigid foam Mary has a four bedroom detached house with a footprint of 150m2.

How To Install Loft insulation With ROCKWOOL Thermal

Rafter Insulation

Insulation helps to maintain the building’s optimum temperature, so you can get creative with the results. Use scissors, as tearing or stretching the material could make it less effective.While there are several options for insulation between loft rafters, PIR (polyisocyanurate) insulation is often the best choice due to its ease of installation, double-sided foil, reasonable cost, and overall accessibility. When insulating a loft, the most practical solution is to place most of the . We detail the options of installing one or two layers! .

Best Loft Insulation: Guide, Types and Tips

You could do what I did, which is: - screw on 2x2 treated timbers to the rafters to increase the depth, so you . Spray foam insulation is a polyurethane foam that is commonly applied to attics and walls and is available in high-, medium-, and low-density. Fitted above the rafters, it keeps the heat in the loft and is used in a loft conversion .For rolled insulation, place it between roof rafters.

Loft Insulation Between Rafters: Your Complete Guide

Insulating your rafters is also often referred to as warm loft insulation.The simplest and cheapest roof insulation is the classic cold loft option.ROCKWOOL FLEXI® has been designed as a multi-use, dual purpose acoustic and thermal stone wool insulation with a unique flexible edge along one side.In this comprehensive guide, we will walk you through the process of installing cold loft insulation, a solution that proves especially practical in scenarios . Turn a loft area into a living space or an extra bedroom or turn a flat roof into a welcoming terrace or green roof.The amount of insulation you can stuff between the rafters obviously depends on their depth, so this reduces the amount of space left for fitting insulation.

Loft conversions need insulating for exactly the same reasons that an inhabitable loft needs insulation.

14 Loft Insulation Dos and Don'ts

if going with professional . Common options include fiberglass, which is cost-effective and . Also, consider what type of climate you live in and what R-value (measurement of resistance to .

Pitched Roof Insulation Under Rafters

Make sure it is flush against the wood, as even a 1-inch gap can cause a 20 percent heating loss. Here at Multifoil Insulation we have created easy to follow instructions, which will enable you to insulate the underside of your roof rafters. Additionally, proper insulation can transform an otherwise unusable attic space into a livable area, potentially increasing your home’s usable .Rafter insulation (between the loft rafters) refers to the pitched part of a roof, which can be insulated with slabs or rolls. Shallow rafters are a typical feature of old buildings; a sacrifice some homeowners are willing to make in favour of preserving character over practicality.

Pitched Roof Rafter Insulation

With shallow rafters unable to accommodate adequate loft insulation to keep the .

Measure all gaps. You’ll need to precisely measure the gaps within your roof in order to cut the boards accurately.

How to Insulate a Loft: A Beginner’s Guide

Although this is a reasonable depth, ideally .Installing effective insulation in an attic, loft, pitched or flat roof is an effective way to reduce heat loss and slash energy costs. Rafters are the sloping timbers that make up the roof itself.In fact, according to the Property Care Association there may be as many as 250,000 homes with spray foam roof insulation in the loft. Temperature maintenance – ROCKWOOL pitched roof insulation prevents heat transfer by keeping buildings warmer during winter and cooler in summer. In fact, insulating roof rafters – also known as loft insulation between rafters – is not just acceptable, but it’s highly recommended, depending on the property’s design and the homeowner’s specific requirements. Cost: $50 cents to $1. As rooms-in-roof are usually used as bedrooms, acoustic performance and sound reduction of external noise should be considered in addition to . Firstly, there are two types of spray foam roof insulation and it’s important to know the difference: Closed cell spray foam roof insulation: This sets into a rigid solid has been . Insulation is placed over and between the wooden joists, above the ceiling of your home's top floor.I-Man, Jan 12, 2022. The installation should take a day, though.Temps de Lecture Estimé: 9 min

Our Mini-Guide to Rafter Insulation

Spray Foam Insulation.

How to Insulate a Pitched Roof at Rafter Level

You or a professional will fit this material between your rafters – which are the beams on your roof – or your joists, which are the beams on your loft floor. The R-value you choose should . Insulation is friction-fitted between rafters, with the option to underline the rafters with a layer of non-combustible Rocksilk ® RS45 to further enhance thermal performance.Start by selecting the right type of insulation; options include batts (fiberglass or mineral wool), rigid foam boards, and spray foam. If you only use your loft for general storage. Installers could charge a daily rate of £200–500 for a loft, with the average cost being around £250. By properly insulating your loft, you can keep your home warmer, reduce energy bills and decrease your .This means putting a layer of insulation like Kooltherm K107 Pitched Roof Board, between the rafters and a second layer, usually insulated plasterboard like . Using a tape measure mark out and make note of each board you will need to cover the entirety of the roof.