GRP Roof &
Corrugated Sheets
Factory-manufactured glass fibre reinforced plastic roofing sheets and corrugated panels — UV-stable, lightweight, and corrosion-resistant for industrial, agricultural, and commercial roofing applications across the GCC.
INTRODUCTION
GRP corrugated and flat roofing sheets are manufactured from chopped strand mat glass fibre reinforcement embedded in UV-stabilised polyester resin, produced as continuous sheets by the pultrusion or continuous lamination process. The finished product is a rigid, lightweight, weatherproof roofing panel that can be installed on standard steel or timber purlins using conventional fixings — with the critical advantage of being inherently corrosion-resistant and requiring no surface treatment for the design life.
ESA Technical Services supplies and installs GRP roofing sheets in standard corrugation profiles (76/18, 32/10, and custom) in both opaque and translucent grades, allowing clients to introduce natural daylighting into industrial and agricultural buildings without the corrosion, weight, and thermal performance limitations of galvanised steel sheeting.
INSTALLATION PROCESS
| 01 | Structural Survey | Purlin condition, spacing, and load capacity assessed. Corrugation profile and sheet length specified to match purlin layout and minimise waste. |
| 02 | Sheet Delivery & Handling | GRP sheets delivered in protective packaging and handled with padded lifting equipment to prevent surface marring. Sheets stored flat on level bearers off the ground. |
| 03 | Sheet Installation | Sheets fixed to purlins using UV-resistant GRP or stainless steel fasteners with sealing washers at every corrugation crown. Sheets lapped a minimum of 1.5 corrugations at side laps. |
| 04 | End Lap Sealing | End laps (minimum 150 mm) sealed with compatible self-adhesive butyl tape along the full lap width to prevent wind-driven rain ingress. Ridge and hip flashings installed in compatible GRP extrusion. |
| 05 | Translucent Strip Integration | Translucent GRP strips installed as daylighting bands in the same corrugation profile as opaque sheets, with sealed laps to match the opaque sheet installation. |
| 06 | Inspection & Sign-Off | Completed roof inspected for correct lap dimensions, fastener spacing, and seal continuity. Any defective fixings or unsealed laps corrected before handover. |
TECHNICAL SPECIFICATION
| Material | GRP — CSM and woven roving in isophthalic polyester |
| Sheet Thickness | 0.8 mm, 1.0 mm, 1.5 mm, 2.0 mm, 3.0 mm |
| Corrugation Profiles | 76/18 (standard), 32/10 (mini corrugated), flat, custom |
| Sheet Width | 900 mm, 1,000 mm (cover width — corrugation profile dependent) |
| Sheet Length | 1,800 mm to 6,000 mm (standard); longer by special order |
| Light Transmission | 8–85% (clear / translucent grades — UV-stable type) |
| Impact Resistance | ≥ 10 J (Charpy impact — ASTM D256) |
| UV Resistance | ASTM G154 — 3,000 hrs; no cracking, no delamination |
| Fire Classification | Class 3 (BS 476 Pt 7) standard — Class 1 available |
| Thermal Expansion | 2.5 × 10⁻⁵ /°C (allow for fixings with slotted holes) |
| Weight | 2.0–5.5 kg/m² (profile and thickness dependent) |
| Design Life | 20–25 years (UV-stabilised grade in GCC climate) |
KEY BENEFITS
Corrosion-Free for Life
GRP corrugated sheets never rust, delaminate, or require re-coating — eliminating the costly periodic painting cycles associated with galvanised steel sheeting in humid UAE environments.
Integrated Daylighting
Translucent GRP sheets in the same corrugation profile allow daylighting strips to be installed with identical fixings and sealing details — no separate rooflight products required.
Lightweight Installation
At 2–5 kg/m², GRP sheeting is significantly lighter than steel, reducing purlin and structure loading and enabling safer handling at height without mechanical lifting equipment.
Chemical Resistance
GRP is unaffected by industrial fumes, acid rain, and atmospheric salt — critical for roofing over chemical storage, marine facilities, and coastal industrial buildings.
Lower Lifecycle Cost
Higher initial cost than galvanised steel is offset by zero corrosion maintenance, no repainting, and a service life 2–3 times longer in aggressive environments.
Thermal Performance
Lower thermal conductivity than steel reduces heat transmission into buildings, contributing to reduced cooling loads in GCC climate applications.
APPLICATIONS
ESA
Request a GRP Roofing Quotation
Provide your roof area, purlin spacing, and corrugation profile preference — we will prepare a supply and install price.