If your roof is already leaking, cracking, or turning your top-floor rooms into an oven every summer, this is the service built for it. Whether you're searching for a waterproofing roof fix, a general service roofing option, or specifically roof heatproofing for a house that's already built, Ghar Plans' process for old houses starts by treating the roof you actually have — years of wear, old coatings, and all — rather than assuming a clean slate the way a brand-new roof allows.
How Ghar Plans Delivers This Roofing Service for Old Houses
Because an old roof isn't a blank slate, this process spends its first three steps on repair before any waterproofing coating goes on. Here's exactly what happens at each stage:
Step 1: Roof Grinding. Because this is an old house, we start with something the new-house process doesn't need: grinding the existing roof surface. This mechanically strips away weak or loose particles, old coating layers, and uneven high spots left over from however the roof was originally finished, so what's left is a sound, level surface rather than a patchwork of old material that a new coating would just be masking rather than bonding to.
Step 2: Deep Cleaning. With the surface ground back, the roof is deeply cleaned to clear away dust and debris from the grinding itself, along with anything else that's built up over the years. This is what gives the coats that follow the clean, bare surface they need for maximum bonding — skipping this step is one of the most common reasons a waterproofing job fails early on an older roof.
Step 3: Crack Filling & Repair. Every visible crack and damaged area is carefully filled and repaired at this stage, before any coating goes on. An old roof has usually had years of thermal expansion and contraction to develop hairline cracks and weak points, and sealing these individually first means the system that follows is going over a genuinely sound structure, not just painting over an active leak.
Step 4: Primer Coat. Next, we apply a primer coat — a very thin mixture of Sikalastic®-510 diluted with water — across the surface. Diluting the first pass this way lets it penetrate into the prepared concrete more effectively than a full-strength coat would, improving adhesion for everything applied on top of it.
Step 5: First Coat of Sikalastic®-510. With the primer in place, we apply the first full coat of Sikalastic®-510 evenly across the entire roof. Sikalastic®-510 is Sika's liquid-applied, heat-reflective “cool roof” coating, so from this point on the roof isn't just being waterproofed — it's also being built up into a system that reflects solar heat rather than absorbing it.
Step 6: Fiber Mesh Installation. On top of the first coat, we install high-quality fiber mesh across the surface. Embedding the mesh between coats rather than leaving it exposed lets it reinforce the waterproofing layer from within, giving the finished system better resistance to future cracking as the roof continues to expand and contract with the seasons.
Step 7: Final Coat of Sikalastic®-510. The process finishes with a final coat of Sikalastic®-510 applied over the fiber mesh, sealing it into the system completely. The result is a durable, heat-reflective, jointless waterproof layer built specifically for a roof that's already been through years of Pakistan's weather — not a quick patch, but a full restoration of the roof's protection.
Together, these seven steps take a roof that's already showing its age and rebuild its protection from the surface up — sealed against leaks, reinforced against future cracking, and reflective against the summer heat.
Why an Old Roof Needs a Different Process to a New One
It would be easy to assume waterproofing is waterproofing, whatever the roof's age — but an old roof and a new one are starting from genuinely different places. A new house's roof is bare concrete that's never been coated, so the process can go straight to sealing it. An old house's roof has usually been through years of sun, rain, and temperature swings, and may already carry an old coating, surface damage, or active leaks — which is exactly why this service starts with roofing repair work (grinding, cleaning, and crack sealing) before any Sikalastic®-510 goes on, and why the finished system is built up in coats around a layer of fiber mesh rather than applied in a single pass. If your house is still under construction rather than already built, see our roof waterproofing and heatproofing service for new houses instead.
Where We Provide This Roofing Service
This roof waterproofing and heatproofing service for old houses is currently available in Lahore, Sialkot, Rawalpindi, Islamabad, Gujranwala, and Gujrat. If your roof is showing damage or leaking in one of these cities, our team can visit, assess how much repair work it needs, and confirm a timeline.
Why Choose Ghar Plans for This Roofing Repair Service
Ghar Plans (GP Design and Construction) is a trusted Pakistani platform for house architectural design, interior design, construction, and building material supply, headquartered in Lahore with projects across cities throughout Punjab. Restoring an old, damaged roof takes more judgment than coating a new one — knowing how much grinding and crack repair a specific roof actually needs before waterproofing even starts — and that's assessment our team makes on site, backed by a company that works on full house construction and repair every day, not a one-size-fits-all coating job.
Frequently Asked Questions
What does this roof waterproofing and heatproofing service include for an old house?
Seven steps: grinding the existing roof surface, deep cleaning, filling and repairing cracks, a diluted Sikalastic®-510 primer coat, a full first coat of Sikalastic®-510, fiber mesh reinforcement, and a final coat of Sikalastic®-510 over the mesh.
What's the difference between this service for an old house and a new house?
An old house needs repair work first — grinding, cleaning, and crack sealing — because the roof has years of wear and may already have damage or an old coating. A new house's roof is bare, freshly cast concrete, so that service goes straight to waterproofing without the repair stage. The old-house process also uses Sikalastic®-510 throughout for both waterproofing and heat reflection, rather than the Sika Seal-105 and separate insulation board used on a new build.
What does roofing repair involve before waterproofing an old roof?
Roofing repair here means grinding away weak particles, old coating layers, and uneven areas, deep cleaning the surface, and then filling and sealing every visible crack — all done before any waterproofing coat is applied, so the coating goes onto a genuinely sound surface rather than over existing damage.
What does heatproofing of roof mean for an already-built house?
For an old house, heatproofing of roof comes from Sikalastic®-510 itself, which is a heat-reflective “cool roof” coating — so the same coats that waterproof the roof also reduce how much solar heat it absorbs, without needing a separate insulation board.
Why is Sikalastic®-510 used instead of a separate heat insulation board on an old roof?
Adding a rigid insulation board like Jumbolon works well on a new roof before any finishes go down, but it's a bigger job to retrofit onto an existing, occupied roof. Sikalastic®-510 delivers heat reflection and waterproofing together in one coated system, which fits an old roof's repair-and-recoat process more practically.
Which cities does Ghar Plans provide this roof waterproofing service in?
This service is currently available in Lahore, Sialkot, Rawalpindi, Islamabad, Gujranwala, and Gujrat.
How do I book this service for my old house roof?
Message our team on WhatsApp or reach out through our Contact Us page with your city and a description of the roof's condition (leaks, visible cracks, age), and we'll arrange a site visit to assess how much repair work is needed.
Give Your Old Roof a Proper Restoration
A leaking or heat-soaked roof rarely fixes itself, and a quick coat over existing damage doesn't last. Message our team on WhatsApp or get in touch through our Contact Us page to schedule your roof waterproofing and heatproofing service in Lahore, Sialkot, Rawalpindi, Islamabad, Gujranwala, or Gujrat.