Adhwa Al Rawafid Electric Industries: Metal Roof Waterproofing in Dammam

Project photos

Tap any photo to enlarge. All photos were taken on site by the ETCE team.

The challenge

The factory roof at Adhwa Al Rawafid carries a steel framework for rooftop equipment, and every bracket that passes through the sheeting is a potential leak path. The survey found rust forming around the screw heads, fixings that had worked loose under daily heat cycling, and open end laps across the roof slope. With electrical production and stock underneath, even a small drip was a risk the client could not accept.

What ETCE did

ETCE treated the roof point by point instead of coating it blindly. Each steel support and bracket base was cleaned back to sound metal and wrapped with an EPDM flashing bonded to the sheet profile. Rusted and loose screws were tightened or replaced and every screw head was sealed individually, and the horizontal end laps were closed with continuous EPDM strips.

Failure points treated on this roof

• Steel column & support penetrations

  Brackets, stanchions and support legs that pierce the roof sealed at the base.

• Screw heads & fasteners

  Loose or rusted fasteners tightened or replaced, and every screw head sealed.

• End laps (horizontal joints)

  Horizontal sheet overlaps cleaned and closed with a continuous EPDM strip.

• Rust & corroded sheet treatment

  Corroded areas cleaned back and covered with EPDM before they perforate.

Materials & method

• EPDM membrane (1.2 mm) cut to width for each detail: UV-stable and flexible at Gulf roof temperatures.
• Promax Bonding Adhesive, rated for surface temperatures up to 120°C, for a permanent bond to the metal sheets.
• Preparation first: old coatings, failed sealant and loose rust removed so the membrane bonds to sound metal.
• Roof-side, zone-by-zone execution so the building below keeps operating with no shutdown.
• Working-at-height HSE: trained crews, full PPE and safety lifelines on every roof.

The result

The support penetrations, fastener rows and laps are now sealed with a UV-stable membrane that moves with the roof instead of cracking. The client has a documented, walkable roof that can be inspected and maintained without disturbing the waterproofing.