All Roofing

Roof Insulation Solutions

Effective insulation is crucial for thermal efficiency, reducing energy costs, and meeting current building regulations. Our extensive range includes:

• Celotex PIR Insulation Boards - High-performance rigid insulation in various thicknesses from 25mm to 200mm
• Recticel Eurothane Boards - Premium thermal insulation for pitched and flat roofs
• Rockwool Mineral Wool Products - Including 100mm Flexi Slab and RWA45 Acoustic options for superior sound and thermal performance
• Specialist Flat Roof Insulation - Like Recticel PowerDeck designed specifically for flat roof applications

Our insulation products come from industry-leading manufacturers, ensuring excellent thermal performance, durability, and compliance with current building regulations.

Roof Construction Materials

For structural integrity and a solid foundation for your roofing project, we offer a wide selection of construction essentials:

• OSB3 Structural Boards - Available in 11mm and 18mm thicknesses, perfect for roof decking
• Structural Plywood Options - Including hardwood poplar core and pine varieties in 12mm, 18mm, and 25mm thicknesses
• Treated Roofing Battens - BS 5534 compliant 25x38mm battens for secure tile fixing
• Structural Timber - Various dimensions for rafters, purlins, and other roofing structures

These high-quality materials provide the solid foundation necessary for a durable, long-lasting roof installation.

Roofing Membranes & Weatherproofing

Protect your roof structure from moisture while allowing proper ventilation with our selection of roofing membranes and weatherproofing products:

• Breather Membranes - High-performance options for moisture management and weather protection
• Vapour Control Layers - Essential for preventing internal moisture from reaching insulation
• Roof Flashing Materials - For weathertight seals around protrusions and junctions
• Sealing Tapes and Adhesives - Ensure proper sealing between roofing components

These products are designed to create a weather-resistant barrier that protects your property while allowing necessary airflow to prevent condensation.

Roof Accessories & Fixings

Complete your roofing project with our comprehensive range of accessories and fixings:

• Roof Ventilation Products - Ensure adequate airflow to prevent condensation issues
• Roof Fixings - Including nails, screws, and clips designed specifically for roofing applications
• Lead Alternatives - Modern solutions for traditional flashing applications
• Roof Trims and Finishing Details - For a professional, weathertight finish

These quality accessories ensure your roof not only looks professional but performs effectively for years to come.

Why Choose DIY Building Supplies for Your Roofing Project?

Quality Assurance

We started DIY Building Supplies after growing frustrated with poor quality products and disappointing service from typical merchants. Each product in our roofing range is selected for its durability, performance, and value, with materials from trusted UK manufacturers like Celotex, Recticel, and Rockwool.

Professional Expertise

Our knowledgeable team brings years of practical experience to help you select the right materials for your specific roofing project. Whether you're unsure about insulation thickness requirements or calculating quantities, we're just a phone call or email away with expert advice.

Nationwide Delivery

We ship our complete roofing range across mainland UK, ensuring your materials arrive safely and on schedule. Our efficient logistics network means you can access professional-grade roofing products wherever your project is located.

Competitive Pricing

By building direct relationships with manufacturers and operating efficiently, we offer trade-quality roofing supplies at competitive prices. Our online model keeps overheads low, allowing us to pass savings directly to you without compromising on quality.

Frequently Asked Questions

What thickness of roof insulation do I need?

The required insulation thickness depends on several factors including your roof type, building regulations in your area, and your thermal performance goals. Current building regulations typically require:

• New build pitched roofs: Minimum U-value of 0.15 W/m²K (typically achieved with 150-200mm of PIR insulation)
• Existing building retrofit: Minimum U-value of 0.18 W/m²K (typically achieved with 120-150mm of PIR insulation)
• Flat roofs: Minimum U-value of 0.15-0.18 W/m²K (typically requiring 120-150mm of specialist flat roof insulation)

Our team can provide specific recommendations based on your project requirements and help you comply with current building regulations.

What's the difference between PIR and mineral wool insulation?

PIR insulation, often made by brands like Celotex and Recticel, provides higher thermal efficiency per millimetre of thickness. It keeps heat in more effectively with less material, which is especially useful in tight spaces. They also have excellent moisture resistance, making them ideal for areas where damp could be a concern.

Mineral wool insulation such as Rockwool is well known for its superior soundproofing and fire-resistant properties. It’s a flexible material that fits easily between uneven rafters or joists, which makes it great for older buildings or irregular spaces. It is also non-combustible and allows moisture to pass through more easily, helping to prevent damp build-up.

Do you deliver roofing materials nationwide?

Yes, we offer nationwide delivery across mainland UK. Our efficient logistics network ensures your roofing materials arrive safely and on schedule, whether you're in Cornwall or Northumberland. For bulky items like insulation boards and structural timber, we arrange appropriate delivery methods to ensure they reach you in perfect condition.

How do I calculate how much material I need for my roof?

Calculating roofing materials involves measuring your roof area and accounting for factors like roof pitch and shape, overlaps required for boards and membranes, and waste allowance (typically 5-10% depending on complexity).

Our team can help you with these calculations - simply provide us with your roof dimensions, and we'll assist in determining the quantities needed for your project. We can also advise on additional components like fixings and accessories that are often overlooked.

Are your roofing materials suitable for DIY installation?

Many of our roofing materials are suitable for experienced DIY enthusiasts. We offer products that are specifically chosen for their ease of handling and straightforward installation. We provide clear guidance on installation requirements and offer ongoing support to help DIY customers complete their projects with confidence.

However, we always recommend consulting building regulations and, when necessary, professional advice before undertaking significant roofing projects. Safety should always be your priority, especially when working at height.