Concrete Waterproofing in Tantra Hill, Accra — How We Sealed This Roof for 25 Years

This week, Fest Ghana Limited completed a major concrete waterproofing project on a new home in Tantra Hill, North Accra. We sealed a 50 m² flat concrete roof with professional polyurethane membrane — built to last 25+ years through Ghana's rainy seasons, harmattan, and tropical sun.

If you live in Tantra Hill, Achimota, Dome, or anywhere in North Accra and you're worried about your roof leaking — this is what professional waterproofing actually looks like. From the buckets arriving on site, to the final hero shot overlooking the Accra skyline, here's the full story of how we built a 25-year waterproof membrane in one day.

The Project at a Glance

Location	Tantra Hill, North Accra
Surface area	~50 m² flat concrete roof
System used	Single-component polyurethane waterproof membrane (two coats)
Materials	10 buckets of 5kg polyurethane coating + crack filler
Crew	3-person Fest Ghana team
Time on site	1 day (cure: 24 hours)
Expected lifespan	25+ years with 3-year workmanship warranty

Why This Client Called Us

Tantra Hill, located in the elevated North Accra zone between Achimota and Pokuase, is a fast-growing residential area. New homes are going up every month — but most concrete roofs are built without proper waterproofing. The owners only discover the problem during the first rainy season, when water tracks down the walls and damages ceilings, paint, and finishes.

This particular client called us before the rains started — a smart move. New concrete is the easiest surface to waterproof properly: clean, dry, and free of years of accumulated damage. The cost to waterproof now is a fraction of what they'd pay to fix water damage later.

Step 1 — Materials Arrive on Site

The job started with delivery. Ten 5kg buckets of single-component polyurethane waterproof coating, plus crack filler and rollers, were unloaded from the truck and staged at the rooftop access point. For a 50 m² roof requiring two coats, this is the correct material quantity — enough to cover the surface twice with proper film thickness, with a small reserve for tricky edges and penetrations.

If you're calculating materials for your own job: one 5kg bucket of polyurethane covers approximately 5–7 m² with two coats. Always order 10–15% extra for waste, corners, and pipe penetrations.

Step 2 — Surface Preparation (The Step That Decides Everything)

Every waterproofing job stands or falls on surface preparation. Skip this step and your coating will lift within months, no matter how expensive the material.

Our team:

• Swept the entire 50 m² roof clean with stiff brooms
• Removed all loose concrete, dust, and construction debris
• Identified and marked every visible crack — even hairline ones
• Filled major cracks with flexible crack filler and let them cure
• Used butyl rubber tape around any rebar stubs and pipe penetrations

This step alone took two members of the team several hours. It looks unglamorous — just brooms and bending — but this is the foundation that lets the polyurethane coating last 25 years instead of 25 weeks.

Step 3 — First Coat of Polyurethane

With the surface clean and prepped, the team applied the first coat of single-component polyurethane waterproof coating using long-handle rollers. The coating goes down as a thick, self-leveling gray liquid that bonds permanently to the concrete substrate.

Key technique points:

• Continuous coverage — no gaps between strokes
• Extra attention at the roof edges and around the water tank base
• Brush-cut all 90-degree angles where the slab meets the parapet
• Roll evenly — too thick and it cracks during cure, too thin and the membrane has weak spots

First coat applied. Now we wait — 4 to 6 hours for it to cure in Accra's heat.

Step 4 — Second Coat (Perpendicular Direction)

Once the first coat had cured to a tack-free surface, the team came back with the second coat. Critical detail: the second coat is rolled perpendicular to the first. If the first coat ran north-south, the second runs east-west.

Why? This crossing direction is what creates a true waterproof membrane. Any pinholes or thin spots in the first coat get covered by the second. Two layers, in opposite directions, become one seamless film with zero weak points.

This is the technique that separates a 25-year job from a 3-year job. Most contractors apply a single thick coat and call it done. We apply two thinner coats in perpendicular directions — and that's the difference between work that lasts and work that doesn't.

Step 5 — The Finished Result

By late afternoon, the roof was complete. A smooth, seamless gray membrane covered the entire 50 m². Walking on it, you'd think it was poured rather than rolled — that's how level the finish is.

The view from the finished roof says it all. Standing on a rooftop overlooking Tantra Hill and the Accra skyline beyond, the homeowner now has a roof that will protect this house through 25+ rainy seasons without a single leak.

What This Costs (Real Numbers)

For a 50 m² flat concrete roof in Accra, here's the realistic budget:

• Materials only (if doing yourself): 10 buckets of polyurethane @ GH₵500 each = GH₵5,000, plus crack filler and rollers (~GH₵500 extra)
• Professional installation by Fest Ghana Limited: all-in quote includes materials, labor, prep, surface treatment, two-coat application, and a 3-year workmanship warranty

Book a free site assessment and we'll come measure your roof, identify any existing damage, and quote the full job within 24 hours.

Why Tantra Hill Roofs Need Waterproofing

If you're building or buying in the Tantra Hill / Achimota / Dome corridor, listen carefully. North Accra's flat concrete roofs face three specific challenges:

• High elevation = more direct sun. Tantra Hill is one of the highest residential zones in Accra. Concrete roofs here heat to over 60°C in the afternoon, causing thermal expansion that opens hairline cracks over time.
• Heavy seasonal rains. The June–October rainy season hammers North Accra roofs. Unwaterproofed concrete absorbs water, which then evaporates back inward, soaking ceilings and walls from above.
• Harmattan dust + UV cycling. November to March harmattan deposits abrasive dust and dries everything out. Then May rains arrive. This wet-dry-wet-dry cycle is what kills unprotected concrete.

The solution is the same one we used at this Tantra Hill home: professional polyurethane membrane, applied in two perpendicular coats over a properly prepared surface. Done right, it lasts 25 years.

Service Areas in North Accra

We serve homes and commercial properties across all of North Accra:

• Tantra Hill
• Achimota
• Dome
• Pokuase
• Amasaman
• Pantang
• Haatso
• Madina
• Adenta

Same-day or next-day response within Greater Accra. For other regions across Ghana, we travel for medium and large jobs.

Get a Free Site Assessment

If you have a flat concrete roof anywhere in Tantra Hill or North Accra — whether it's new construction or showing the first signs of leakage — call us today. We'll come measure your roof, identify all leak points, and quote the full waterproofing job in writing within 24 hours.

• Phone: 0555 548 001 or 0241 737 026
• WhatsApp: Chat with us on WhatsApp — send a photo of your roof for an initial estimate
• Book online: Book a waterproofing service
• Buy DIY materials: Shop waterproofing products

Fest Ghana Limited is a Ghanaian-owned waterproofing specialist. We install and supply professional waterproofing solutions for flat roofs, parapet walls, fish ponds, water tanks, swimming pools, bathrooms, and foundations across Accra, Tema, Kumasi, and nationwide Ghana — with a workmanship warranty on every job. This Tantra Hill project is one of dozens we've completed across North Accra in 2026.