What Is The Difference Between Warm Deck & Cold Deck Roof?

The terms "warm deck roof" and "cold deck roof" simply refer to the position of the insulation in an overall build-up. A warm deck roof, for example, places insulation above rafter level, indicating that the rafter space beneath is "warm". Whereas, insulation in a cold deck roof, is installed beneath the rafters. The term "cold deck" doesn't mean that the roof itself is cold, but rather that anything above the insulation is subject to colder temperatures. This happens because there's no barrier over the top of the rafters to prevent air from seeping in and circulating through them. Let's break down each method below. Cold Deck: Installing insulation in a cold deck roof at ceiling level creates a colder temperature void, especially during winter, which can contribute to the formation of condensation. This can lead to rotting timber, damp ceilings, and damaged structural integrity. As a result, it's critical to make sure the void is well-ventilated. Flat roof construction was originally done this way, but as insulation has improved over time, the warm deck roof method has become more popular. Warm Deck: In a warm deck roof, the insulation is installed below membrane on top of the roof deck--usually with a vapour control layer placed underneath the insulation. With this type of construction, there's much less risk of condensation because the void remains at a similar temperature to the roof.

What Is The Cheapest Way To Insulate A Roof?

Roof insulation prices will always vary. Roof insulation cost will depend on the size of the space you are insulating, the type of insulation materials you end up buying, and your overall budget. If you are insulating a flat roof, cold or warm deck insulation will set you back at approximately £35 per square meter, with other types of roof insulation coming in at a similar price. Exterior insulation, on the other hand, is a touch more costly at around £80 per square meter. In terms of insulating roof materials, fibreglass (glass wool insulation) is the cheapest type of roof insulation you can buy.

What Is The Recommended Depth For Loft Insulation?

Current building regulations recommend a minimum insulation depth of 270mm (blanket insulation such as mineral or glass wool) in the loft. Multiple layers can be added to the build-up to achieve this. Please consult a professional to determine how much insulation you will need when embarking on a DIY project.

How Much Does a Loft Conversion Cost?

The cost of a loft conversion in the UK can vary widely depending on several factors. Here's a general overview of potential costs:Basic Loft Conversion: A simple loft conversion with insulation, flooring, skylights, and basic electrical work can start from around £20,000 and go up to £40,000 or more.Dormer Loft Conversion: Adding a dormer extension for extra space and headroom increases costs. Prices typically range from £30,000 to £60,000.Hip-to-Gable Loft Conversion: Converting a hipped roof to a gable end creates more usable space. Costs may start around £40,000 and go upwards.Mansard Loft Conversion: A Mansard conversion, which involves altering the roof structure, is generally the most expensive option. Prices can range from £50,000 to £100,000 or more.Luxury Loft Conversion: For high-end finishes, en-suite bathrooms, custom designs (custom roof tiles and roof windows) and premium materials, costs can exceed £100,000.Additional costs to consider include architectural fees, planning permissions, building regulations, and any unforeseen issues that might arise during construction.To get an accurate cost estimate for your specific loft conversion project in the UK, it's recommended to consult with local contractors, architects, or professionals who can provide detailed quotes based on your requirements and the unique characteristics of your property. They will also be able to ensure that your loft is insulated properly.

Roof Insulation | Materials Market

(0)

Roof Insulation

YBS Breathe-R 1.2m x 20m

Ecohome EcoQuilt Expert 1.5m x 10m

81mm Flat Roof Decking Plywood Insulation Panel 2400mm x 1200mm

Ecohome Multifoil Fitting Kit

Ecohome EcoQuilt45 1.5m x 10m

116mm Flat Roof Decking Plywood Insulation Panel 2400mm x 1200mm

Roof Insulation 

Manufacturer

Material type

Thermal conductivity

Width

Thickness

Compressive strength

Fire rating

Colour

Related Articles

How to Install XPS Insulation

Is Polystyrene A Good Insulator?

How to Insulate Under Floorboards Without Removing

How to Insulate a Loft

How To Cut Insulation Rolls

Insulating A House: Where, How & Why?

How To Install Celotex Insulation Boards

Difference Between XPS and EPS Insulation

Insulation Rolls vs Insulation Slabs: Which Type is Better in a Partition Wall

Insulation Material Types and Their Uses

Celotex Floor Insulation Guide

Celotex vs Kingspan: What’s the Difference?

All Categories

Insulation Boards

Insulation Slabs

Insulation Rolls

Material Type

Applications

Insulation Accessories

Plasterboard

Insulated Plasterboard

Metal Studs & Ceilings

Bagged Products

Other Boards

Drylining Accessories

Cladding

Treated Timber

Sheet Materials

Loft Boards

CLS Timber

Planed Timber

Sand & Aggregates

Cements & Limes

Bricks & Blocks

Lintels

Builders Metalwork

Drainage

Guttering

Internal Doors

External Doors

Skirting & Architrave

Windows

Door Furniture

Door Frames

Fencing

Decking

Landscaping

Driveways & Paving

Plasterboard Fixings

Wood & Timber Screws

Fixings & Fasteners

Insulation Screws & Fixings

Nails & Anchors

Glues & Adhesives

Silicone & Sealants

Tapes

Foams & Fillers

Lubricants, Oils & Sprays

Specialist Paint

Hand Tools

Power Tool Accessories

Site Supplies

Packs of Timber