DC315 is a water-based intumescent coating designed specifically for application over spray polyurethane foam (SPF) insulation. It provides a 15-minute thermal barrier to achieve Class 1 fire rating.

How many coats of DC315 do I need?

One coat at 18 wet mils (0.46mm) provides a 15-minute thermal barrier and Class 1 fire rating. Each 5-gallon pail covers approximately 30 m².

What colours is DC315 available in?

DC315 is available in White, Black and Ice Grey to match different interior finishes and spray foam appearances.

Can DC315 be used on open-cell and closed-cell foam?

Yes. DC315 is compatible with both open-cell and closed-cell spray polyurethane foam. Coverage rates may vary slightly with foam texture and density.

Is DC315 required by building regulations?

In most UK applications, a thermal barrier or ignition barrier is required over exposed spray foam insulation. DC315 satisfies this requirement. Consult your building control officer for site-specific guidance.

What is the drying time?

DC315 dries to touch in 1-2 hours and is fully cured within 24-48 hours at normal room temperature and humidity.

How do I order in bulk?

We offer trade pricing on bulk orders. Call 01208 832602 or email info@duratite.co.uk for a custom quote. All prices are negotiable on volume.

What are the delivery options?

We offer Standard Delivery (2-3 working days) and Next Day Delivery. Orders placed before 3pm on weekdays are dispatched same day. Use the delivery countdown on this page to see your cut-off time.

Do you provide technical support?

Yes. Free technical advice is available on 01208 832602. Duratite has specialised in coatings and waterproofing across the UK since 2015.

DC315 Intumescent Coating For Spray Foam Insulation

Overview

DC315 intumescent coating is a high-performance, single-component paint designed to improve the reaction to fire of spray foam insulation and other polyurethanes. It acts as a Thermal Barrier System and Ignition Barrier that can be applied over open and closed cell spray foams to achieve a Euroclass B-s1-d0 and B-s2-d0 reaction to fire rating as tested to BS EN 13501-1.

£339.00 + VAT

Specification

Approved 15-Minute Thermal & Ignition Barrier (per IBC 2603.9 / IRC R316.6)
Achieves a Euroclass B-s2-d0 resistance to fire as tested to BS EN 13501-1.
Code Compliant in USA (ICC-ESR 3702), Canada (CCMC #14036-R), EU (EN13501 B-S2-d0)
Compatible with Open and Closed Cell SPF (e.g., Nexseal LE, Enverge Nexseal, Enverge Sucraseal)
Water-Based, Low VOC: ≤18.6 g/L
Excellent Adhesion and Durability
NFPA 285 Rated for Use in Exterior Walls
Easy Application via Sprayer, Brush, or Roller
Safe for Schools and Food Contact Areas (ANSI 51 / CAL 1350)
Shelf Life: 18–24 months (unopened)
Clean-up with Water

Ideal for coating over new or existing spray foam insulation to improve resistance to fire:

Existing Open Cell Spray Foam Insulation
Existing Closed Cell Spray Foam Insulation
A new Open or Closed Cell Spray Foam Insulation system.
Roofs, Attics, Walls, Crawlspaces, and Ceilings
Warehouses
Industrial and Agricultural Buildings
Exposed spray foam insulation in Steel Building Assemblies
Over existing Icynene Spray Foam Insulation.
Over existing LogicFoam Spray Foam Insulation.
Over existing Lapolla Spray Foam Insulation.
Over existing Synthesia Spray Foam Insulation.
Over existing ThermoFoam Spray Foam Insulation.
Over existing Isothane Spray Foam Insulation.
Over Existing BASF Spray Foam Insulation.

Application Methods:

Airless Spray (preferred)
Brush (multiple coats may be required)
Roller (multiple coats may be required)

Airless Spray Guidelines:

Airless Sprayer: Recommended (e.g., Graco Mark V / Titan Impact 1140)
Tip: 517–525 / Pressure: 2500–3000 psi
Roller/Brush: For touch-ups or confined areas

Brush Application: May result in ribbed appearance; multiple coats often required to achieve equivalent dry film thickness (DFT).

Property Value

Estimated Coverage:

Wet Film Thickness (WFT)	Sq. Ft./Gallon	Sq. Ft./5 Gallon
4 mils	400 sq. ft.	2,000 sq. ft.
14 mils	115 sq. ft.	575 sq. ft.
20 mils	80 sq. ft.	400 sq. ft.
24 mils	67 sq. ft.	335 sq. ft.

Standard Application WFT: 0.7mm (approx. 27.5 mils) – may require 2 coats
Recommended Build: Use wet film gauge and medallions for QA/QC

DC315 Recommended Installation Guidelines:

1. Surface Preparation

Allow SPF (e.g., Nexseal LE) to fully cure (24 hrs minimum)
Surface must be dry, clean, textured (orange peel or coarse)
Light abrasion or flash coat if surface is glossy
Remove contaminants and loose particles

2. Mixing & Application

Mix Mechanically: 4–5 minutes with paddle mixer
Do Not Thin (unless restoring sprayability with water per guide)
Application Tools:
- Airless Sprayer: Recommended (e.g., Graco Mark V / Titan Impact 1140)
- Tip: 517–525 / Pressure: 2500–3000 psi
- Roller/Brush: For touch-ups or confined areas
Spray Technique:
- Crosshatch (X-out) method for even coverage
- Overlap 50% per stroke
- Maintain airflow; avoid high humidity during curing

3. Curing Conditions

Ambient Temp: 50°F–90°F
Humidity: 50–65% optimal (max 85%)
Use fans and mechanical ventilation in enclosed areas
Cure time varies; ensure full cure before occupancy or topcoating

4. Clean-Up

- Use clean water; do not allow to freeze
- Store between 50°F and 80°F in sealed containers

DC315 Product Limitations

Not to be used as an exterior topcoat unless tested and approved
Do not exceed 24 mils WFT in a single coat
Not suitable for potable water contact or constant immersion
Not certified for use over unknown foam systems (must be tested per ESR)
Environmental conditions must be controlled during and after application

Pack Size: 5 Gallon/19-litre units
Shelf Life: 18-24 months from manufacture
Storage: Cool, dry conditions. Avoid prolonged moisture exposure before drying.

Fire Testing: BS EN 13501-1 Euroclass B-s2-d0
VOC Compliant with EC & UK Regulations

Refer to the product-specific Health & Safety Data Sheet for complete guidance on handling, PPE requirements, and storage.

Globally Approved: IBC, IRC, NBCC, EU, AUS/NZ compliant
Extensive Testing: Over 60 fire test assemblies
Third-Party Verified: WHI, UL, ICC, ULC, CCMC
Fast, Safe, and Reliable: Ideal for code officials, applicators, and building owners

Ready to Specify or Purchase?

Contact our technical sales team for:

Specification support
Fire engineering assessments
Pricing and lead times