SPF Spray polyurethane foam
Introduction:
SPF Spray polyurethane foam is a spray-applied plastic that forms a continuous layer of insulation that performs the role of air sealing on all contoured surfaces like roofs, walls, and around the corners. It is an excellent method to resist heat transfer; it can also provide an effective solution for the reduction of unwanted air infiltration via seams, cracks, and joints. Due to their satisfactory performance regarding seal and insulation of building Spray foam rigs or spray polyurethane foam (SPF) has been grown to a decent amount in the past few years. It keeps your house warm in winter while cool in summer. Apart from this, it can be durable, long-lasting, and energy-efficient. Spray foam rigs help in insulating air seals, which provide an effective and secure pathway of weatherizing both already constructed and new ones. Installing measuring and inspecting steps and tips for Spray foam rigs were decided with the consent of the manufacturer.
Kinds of SPF:
There are three main types of it which are mentioned below:
- The high density which is used for roofing and exterior applications
- The Medium density which is used for continues insulation purpose, unvented attic application
- The Low density which is used for unvented attic applications and interior cavity fill
High density and medium density are often called as “closed cell foam” due to the presence of tiny holes in cell structure, which provide the enhanced capability of drying and flexibility. Apart from structure, other main variations are regarding its creation and installation. There are two central systems of delivery.
- High pressure, two-component foam
- Low-pressure two-component foam SPF kits
High-pressure two-component foam:
It is mainly used for the insulation of large areas in new construction work or renovations of roofs and walls. A spray rig or trailer that contains ingredients for spray foam, the supply of air, and other required items is parked near to that particular building, which is supposed to be sprayed. Liquid ingredients will be delivered to the application area by hose up to about 300 feet. \
Low pressure, two-component SPF kits:
Low pressure, two-component SPF kits or refillable cylinder are smaller and portable system which can air seal and insulate to medium-sized areas. Usually, that type of foam is applied around the piping penetrations, electric, ductwork, rim joists, and roof repairs. Both models are used with the help of professional foam applicators.
Health and safety concerns while working with SPF:
As we all know, while working anywhere, the health and safety of the worker is the primary focus. Same in this case, while working with SPF, there are concerns regarding health and safety. However, EPA (Environmental protection Agency) has declared it relatively inert matter once it’s properly installed and allowed to set.
Chemical overview of SPF:
We came to know after its chemical analysis that SPF is composed of a material formed by mixing MDI methylene diphenyl diisocyanate and polyol blend. Their reaction is an exothermic process, and foam is formed within a few minutes, which is not sticky or tacky at all. MDI is known as A-side, and polyol blend is called the B side in the United States of America.
Health risk of A-Side MDI:
Problems like irritation and sensitization can happen when it gets inhaled or comes in contact with skin. Lungs, eyes, and skin can get affected after exposure. People who are sensitized once should be removed from potential exposure activities because continuous exposure can cause asthmatic reactions, which can be life-threatening. While working with MDI, always wear PPE (Personal protective equipment) and see the MSDS (Material Safety Data Sheet) for more information regarding health.
B-side or Polyol:
This part of SPF uses five main classes of chemicals which are given below:
- Blowing agents
- Catalysts
- Flame retardants
- Surfactants
- Polyols
Potential health risks include eyes, skin, and irritation to the respiratory system. It is very much necessary to wear PPE while working with this chemical.
Cured from of chemical:
After the reaction of A-side and B-side, the product formed is polyurethane is regarded mainly as non-hazardous and inert when it is properly cured and installed. Avoid exposure of foam to open flame or extreme heat; more than 200oF foam can get ignited in both cases.
Effect of SPF application on the newly built building:
Different aspects were analyzed to check the result of SPF on building after the use and setting. The following recommendations were made on the bases of visual examination.
- Specific assemblies are sufficiently insulated following the project scope.
- Installed SPF has given a continuous air barrier
- SPF is adhered fully with substrates and also strongly bonded to cavity framing members
- Surface profile is satisfactory
- Color is consistent and uniform
- SPF is free from cracks, delamination, and blisters
- Thermal, ignition barriers, and covering and coatings are installed according to the requirement of codes.
Overall, SPF is very much beneficial as insulation because it helps in regulating the temperature of the building, keeps it warm in winter and cool in summer by resisting the heat exchange process. It keeps the surface clean and free from cracks. Apart from this, SPF (spray polyurethane foam) application can also have many prominent features; it can expand in a place, can seal cracks, and can fill gaps and penetrations. It also acts as a compulsory component of an air barrier system that runs through the entire building like an envelope. It can also be used as a sealant and caulks around the windows, doors, and framing, which further reduce the air leakage in the building and produces an increase in energy savings. It can make the overall look of building or job site better and more presentable. Any insect or rodents attack can also be prevented. It saves workers working at the job site from UV radiation coming from the sun. It is sporadic that the Spray foam surface is entirely flat. There are many reasons for variations. Closed SPF has fewer changes than open-celled SPF. Despite differences in profile, it maintains an average outlined in the applicable building codes.