Roof Heat Control  •  12 min read  •  Floorzy Makeover, Bangalore

Heat Lock for Factory Sheds: The Complete Guide to Cooling Down Your Roof

If you run a factory or warehouse in a metal-roofed shed, you already know what April to June feels like. The shop floor turns into an oven by 11 a.m., fans just push hot air around, and everyone from the workers to the machinery is under stress they shouldn’t have to be. This guide walks through exactly what Heat Lock is, how it works, what it actually costs, and a real project where it was used — so you can decide if it’s right for your shed.

Heat Lock by DUSH Italy, applied by Floorzy on industrial shed roofs across Bangalore and Karnataka.

Why Factory Sheds Get So Hot in the First Place

Most industrial sheds in India are roofed with plain galvanised iron (GI) sheets, pre-painted steel, or asbestos cement — all of which are very good at absorbing heat and very bad at reflecting it. A standard GI roof absorbs somewhere between 85% and 95% of the solar energy that hits it. During peak summer hours, that pushes roof surface temperatures up to 65–75°C. Almost all of that heat eventually radiates down into the shed below, which is why the air near the roof — and often the whole shop floor — feels unbearable by midday.

Adding more fans or exhaust systems doesn’t fix this, because fans only move hot air around; they don’t stop the roof from absorbing heat in the first place. To actually bring the temperature down, you have to deal with the problem at the source: the roof surface itself.

What Is Heat Lock?

Heat Lock is a solar-reflective, thermal-barrier roof coating manufactured by DUSH Italy, a coatings specialist based in Italy. Floorzy Makeover is an authorised applicator of Heat Lock across Bangalore and Karnataka, meaning we source the material directly and apply it to your existing roof — no roof replacement, no demolition, and no factory shutdown required.

Instead of relying on a single gimmick, Heat Lock works through three measurable physical mechanisms:

• Solar Reflectance (SR): 0.65–0.80. This means Heat Lock reflects 65–80% of the solar radiation that hits the roof, compared with only 5–15% for an untreated GI roof.
• Thermal Emittance (TE): greater than 0.85. Whatever small amount of heat the coating does absorb, it releases back into the atmosphere quickly instead of transferring it into the building.
• Thermal mass behaviour. The coating also slows down how fast any residual heat moves through the roof sheet into the air space below.

Solar reflectance and thermal emittance are the same two metrics used internationally to rate “cool roof” coatings — they’re physical, measurable properties, not marketing terms, and they’re why Heat Lock’s performance can be demonstrated with an infrared thermometer on the spot rather than just claimed.

Heat Lock is applied as a 2-coat system directly over the existing roof surface.

What You Actually Get: The Core Benefits

Technical Specifications

The full data sheet for Heat Lock as applied by Floorzy on industrial roofs.

Heat Lock is not suitable for clay tile or slate roofing, but it covers the substrates most common on Indian industrial sheds — GI sheet, pre-painted steel, asbestos cement, and flat concrete roofs.

Roof Types and Facilities Heat Lock Works For

• GI sheet roofs — the most common industrial roof type in Karnataka, and the one that benefits most from a reflective coating.
• Pre-painted / colour-coated steel roofs — common in newer industrial construction.
• Asbestos cement roofs — widely used in older industrial buildings; Heat Lock can be applied without removing or disturbing the existing sheets.
• Cold storage facilities — where roof heat has a direct impact on refrigeration running costs.
• Food processing units — where temperature control matters for both product quality and worker safety.
• Schools and institutional buildings — metal-roofed halls and classrooms, where comfort matters just as much as it does in a factory.

Real Project: Textile Unit, Peenya Industrial Area, Bangalore

Heat Lock vs. Other Ways to Cool a Factory Shed

How Heat Lock compares with the other approaches factory owners typically consider.

Roof insulation and false ceilings can reduce temperature by a similar or greater margin, but they cost significantly more, take much longer to install, and usually require at least a partial shutdown. Exhaust fans are cheap and fast but only move air around — they don’t stop the roof from absorbing heat, so the improvement is limited. Ordinary white roof paint reflects some heat when it’s freshly applied, but it isn’t formulated to resist dirt build-up and UV breakdown, so the effect fades within a year or two. Heat Lock’s balance of a meaningful temperature drop, low disruption, and fast installation is what makes it the option most factory owners land on once they’ve compared all four.

What Facility Managers Are Saying

How Much Does Heat Lock Cost?

Heat Lock is typically priced from ₹30 to ₹55 per square foot of roof area for the complete 2-coat application, including materials, access equipment, and labour. For a mid-sized 5,000 sq. ft factory roof, that works out to roughly ₹1.5–2.75 lakh for the full job. Larger roofs above 20,000 sq. ft usually qualify for volume pricing. The exact figure depends on your roof’s current condition, access, and how much surface preparation is needed — which is why Floorzy does a proper site visit before quoting rather than pricing over the phone.

Frequently Asked Questions

Is Heat Lock Right for Your Shed?

If your factory or warehouse roof is plain GI sheet, pre-painted steel, asbestos cement, or concrete — and summer heat is genuinely affecting your workers, your machinery, or your cooling bills — Heat Lock is worth evaluating. It doesn’t require you to shut down, replace your roof, or take anyone’s word for the numbers: you can see the temperature difference on a sample panel before you commit to anything.

Figures in this article — temperature reduction, energy savings, technical specifications and the Peenya case study — reflect data published by Floorzy on floorzy.in at the time of writing. Actual results vary by roof material, condition, orientation and local weather; Floorzy recommends a sample panel demonstration on-site before installation.