Cost guide

What Elastomeric Coating Costs on a Florida Block Home

Elastomeric is not paint and it is not priced like paint. Most of the money is in preparation, and on a Port St. Lucie block home that prep is what decides whether the coating lasts.

What elastomeric actually is

Elastomeric is a thick, flexible, water resistant coating built for masonry. Applied correctly it goes on far heavier than house paint and cures into a continuous membrane that stretches across hairline movement instead of splitting over it.

That stretch is the whole point on a Florida block home. Block and cement stucco crack. They crack from shrinkage, thermal movement, settlement and stress at window and door corners. Every one of those cracks is a path for wind driven rain, which is exactly what hurricane season delivers to the Treasure Coast.

A regular paint film is thin. It bridges nothing. It follows the wall into the crack and splits along it. Elastomeric answers that specific problem on that specific type of house, which is why it is so common from Fort Pierce down to Hobe Sound.

It is not paint, and it is not priced like paint

The most common shock on an elastomeric quote is the comparison to a standard repaint. Coating a block house typically runs around one and a half to two and a half times a conventional exterior repaint of the same house, and there are real reasons for that.

The material is thicker, covers far less area per gallon, and usually goes on in two coats to reach the film thickness it needs. Product data sheets specify a dry film thickness and hitting it is not optional. A thin elastomeric coat is just expensive paint that has lost the one property you paid for.

It also takes longer to apply, needs spray and back roll technique to work it into the texture, and demands more preparation than a repaint. A quote that prices coating like paint has not planned to apply it properly.

• Higher film build, meaning far fewer square feet covered per gallon
• Usually two coats to reach specified thickness
• Spray and back roll application into the wall texture
• Longer cure and recoat windows, especially in summer humidity

The ranges on a Treasure Coast block home

Elastomeric is priced by wall area, not by the floor area of the house. Get your own rough number first. Walk the perimeter, multiply by wall height, and take off fifteen to twenty percent for windows, doors and the garage. A typical single story block home here lands between 1,600 and 2,400 square feet of wall.

With that number in hand, the market ranges below become usable. Treat them as a frame for a budget and for reading quotes, not as a price for your house.

The spread is almost entirely preparation. Two identical houses in the same St. Lucie West cul de sac can sit at opposite ends of that range, because one has clean sound walls and the other has cracking, chalking and a failing previous coating that has to come off.

• Straightforward single story block home, clean walls, commonly $2.00 to $3.50 per square foot of wall
• Significant crack routing, patching and surface repair, commonly $3.50 to $6.00 per square foot
• Two story or heavy access requirements, add for staging, scaffold or lift
• Removing a failed prior coating, priced separately and it is not a small line
• A common single story block house often lands in the $4,000 to $9,000 total range once wall area and prep are combined

Prep is most of the money

This is where a cheap bid is usually cheap. Elastomeric bonds to what is under it. If what is under it is chalk, dirt, salt residue, mildew or a coating that has already lost its grip, the new membrane fails at that layer no matter how good the product is.

Real preparation means pressure washing off chalking and biological growth, letting the wall dry, routing and sealing moving cracks rather than smearing coating across them, patching spalled areas, priming bare or porous stucco, and masking windows, tile roof edges, soffits, pool cages and landscaping.

Homes near the coast and the Indian River Lagoon also carry salt deposits on the walls, which is a bonding problem specific to this part of Florida. Washing that off is not padding the invoice. It is the difference between a coating that holds and one that peels in sheets.

• Pressure wash and full dry time before anything is applied
• Route, seal and treat moving cracks individually
• Patch spalled, hollow and previously repaired areas
• Prime bare, patched or highly porous surfaces
• Remove any prior coating that is already failing
• Mask barrel tile edges, soffits, windows, screen enclosures and landscaping
• Wash off salt deposits on homes near the coast and the lagoon

When elastomeric is the wrong answer

Coating is not a repair and it is not a waterproofing system on its own. There are situations where spending money on elastomeric makes things worse, and a good contractor will say so before selling it.

If a wall is hollow or delaminated, coating seals the failure in and hides it. If water is entering at a window flashing or a roof to wall junction, coating the wall field does not touch the actual leak. If moisture is moving through the wall from inside, a heavy exterior coating can trap it and push the failure somewhere else.

So sound the walls before you coat them. Tap across each elevation and listen for the change from a solid ring to a dull thud. Anything that thuds gets repaired first.

• Hollow or delaminated stucco, repair before coating
• Active leaks at flashings, penetrations or roof to wall junctions
• Rust staining and spalling, the steel has to be treated first
• Walls that are still wet, coating traps the moisture
• A previous coating that is peeling, it has to come off first

Colour, sheen and HOA approval

Colour has a practical dimension here beyond taste. Deep saturated colours absorb more heat, and heat drives more thermal movement in the wall behind the coating. Lighter colours are the norm across most Treasure Coast neighbourhoods for reasons that are partly aesthetic and partly physics.

Sheen matters too. Flat and low sheen finishes hide wall imperfections and texture variation, and stucco walls have plenty of both. Higher sheen picks up every trowel line and every patch under afternoon sun.

If you are in a community such as Tradition or St. Lucie West, or any neighbourhood with an active association, exterior colour usually goes through architectural review. Submit before you buy material and before you schedule the crew. Approval timelines are set by your association, not your contractor, and repainting a whole house in an approved colour afterward is the most expensive avoidable mistake in this work.

What to get in writing before you sign

Elastomeric quotes are easy to compare once you know what to ask for, because most of the variation sits in prep and film thickness rather than in the product.

Get the scope written down. Measured wall area, number of coats, target film thickness, exactly what preparation is included, how cracks are treated, and what happens if hollow areas turn up during washing. A quote that specifies those things is comparable to another that specifies them. A one line quote is not comparable to anything.

Then get the site visit. Every range here is a market frame for Florida block homes. Your number depends on your wall area, your access and what is found once the walls are washed, and nobody can produce it honestly from a phone call.

• Measured wall area and how it was calculated
• Number of coats and the target dry film thickness
• Written preparation scope, washing, cracks, patching and priming
• Whether a prior coating is being removed and how that is priced
• Access plan, ladders, staging or lift
• Protection and cleanup, including pool cage, tile roof edges and plantings
• What happens to the price if hollow areas turn up during prep