Frequently Asked Questions
What applicators, builders, and building owners ask about foam.
Choosing a Grade
Closed-cell or open-cell — how do I decide?
If moisture is anywhere in the picture, closed-cell. That covers metal buildings, agricultural and cold storage, crawl spaces, rim joists, and anything below grade or exposed to bulk water. Open-cell is for sound attenuation between conditioned spaces and for economical cavity fill in assemblies specifically designed to dry inward. When in doubt in an ag or industrial building, it is closed-cell.
How thick does it need to be?
It depends on climate zone, the assembly, and what you are trying to achieve. Closed-cell is typically 2–3" in walls and rooflines; potato and cold storage often go thicker; roofing grade runs 1–1.5" nominal with taper for drainage. Tell us the building and the climate zone and we will spec it rather than have you guess.
Is foam really better than batt insulation?
For air sealing, unambiguously — batt does nothing about air movement around it, and in a real building that leakage is a large share of the actual loss. For pure R-value per dollar in a well-sealed, well-built cavity, batt can compete. In metal buildings, agricultural structures, and anywhere condensation is the problem, there is no comparison.
Does closed-cell foam add strength to a building?
Yes, measurably. Closed-cell foam adheres to the sheathing and framing and contributes racking resistance to the assembly. In metal buildings this is a real secondary benefit, though it should be treated as a bonus rather than something you design a structure around.
Code, Safety & Durability
Does spray foam need to be covered?
In most occupied spaces, yes. Foam is a combustible plastic and codes generally require a thermal barrier — typically gypsum board — between it and occupied space, or an approved ignition barrier coating in limited-access areas such as crawl spaces and attics. Requirements vary by jurisdiction and by access, so verify locally before you quote.
Is it safe to spray, and when can the building be reoccupied?
It is safe when handled properly and genuinely hazardous when it is not. Isocyanate exposure during application requires supplied-air respiratory protection, full skin coverage, and controlled site access. Re-occupancy requires ventilation for the period stated on the data sheet. Read the safety data sheet and follow it — this is not an area to improvise in.
Can foam be left exposed outdoors?
No. No foam grade is UV stable — exposed foam will degrade and chalk away from the surface inward. Anything in sunlight has to be coated, which is why roofing foam is always part of a foam-and-coating system rather than a standalone product.
Why do people say foam can scorch or fail?
Almost always because it was applied too thick in one pass or sprayed off-ratio or cold. Closed-cell foam generates exotherm heat as it cures; too much in one lift traps that heat, ruins the cell structure, and in extreme cases chars the interior of the pour. Follow the pass thickness on the data sheet, keep the proportioner in ratio and at temperature, and check substrate temperature rather than air temperature.
Roofing, Equipment & Supply
Can spray foam actually be used as a roof?
As a roof substrate, yes — it is one of the best low-slope systems available because it is fully adhered, seamless, insulating, and can be tapered to correct drainage. But foam alone is not a roof. It must be coated. OR-80SLM Silver Lining Membrane, a Miami-Dade approved pure polyurea, is the membrane we specify over it at 40–60 mil DFT.
What equipment do I need?
A plural-component proportioner with a heated hose — Graco Reactor E-20 or E-30 class or equivalent — transfer pumps, an appropriately configured spray gun, and supplied-air respiratory protection for the crew. Rig sizing depends on the grade and the daily output you need; talk to us before you buy, because undersizing a machine is the most common and most expensive startup mistake.
Do you private label the foam?
Yes. Every grade is available as WatchGuard or under your own brand, with technical data sheets and safety data sheets included. Applicators, distributors, and equipment dealers all do this. Foam is a consumable — if you are putting rigs in the field, the drums that go through them should have your name on them.
Do you sell to building owners, or only to applicators?
Primarily to applicators, distributors, and builders, because this is not a product an untrained buyer should be spraying. If you own a building and need it foamed, contact us anyway — we can usually point you toward an applicator in your area and help you understand what a good spec looks like before you take bids.
Question About a Specific Assembly?
Building type, climate zone, and what it is used for. You will get an answer from someone who has sprayed foam, not read about it.
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