gap filling PU foam

Door Frame fixing with Gap Filling PU Foam Spray.

This article will help explain you about how gap filling pu foam spray can be used effectively for door frame fixing, it includes:

  • Why is a polyurethane foam sealant required for door frame installation
  • advantages of polyurethane foam spray sealant for door installation
  • What is a good quality expanding foam sealant.
  • How to use insulation polyurethane foam spray can for door frame installation
  • FAQs on PUF sealant related to door frame installation
  • How to contact Anagha Engineers experts for demo, samples, technical/ commercial information, orders

Need for gap filling PU foam spray? 

Window and doorframes are made of materials such as wood, aluminum, steel and UPVC. Traditional window and doorframes are installed by using frame anchors and gaps filled with white cement/ putty.  This method

  • Is time consuming and requires craftsmanship.
  • Cement/ Putty tend to crack over time due expansion/ contraction cycle of construction joints
  • poor aesthetics
  • Entire load is shared by the anchor fasteners, due to excessive stress at few points stress failure may lead to door frame failure.
  • Installation is unrelaible and cost is also high.  

Using polyurethane foam sealant can significantly reduce labour costs and improve strength of door frame.

Advantages of PU foam spray vs traditional methods 


  • provides increased structural strength to the door frame due to high bonding strength. You can reduce the number of anchor fasteners used for fixing the door frame. 
  • PUF is not rigid like white cement or putty, hence the joint doesnt crack with time due to expansion & contraction. 
  • Lower labour cost due to fast process. 
  • Higher productivity
  • additionally provides sound and thermal insulation.
  • can be cut with a knife, sanded, painted like normal gap filling putties. Finish or aesthetics is much better than other regular methods.
  • Overall lower cost   

Gap filling PU foam for Door / window frame installation 


What is a good quality PUF Sealanttypes of foam sealant

  • Density of cured PU foam, high density pushes the door frame while low density puf shrinks due to load. Ideal: 25- 30 Kg/m3
  • Output of foam generated per 750 ml can, joint yield. Length of joint covered with 750 ml can is approximately 30 meters. It may vary depending on the gap width & depth between door frame and wall. 
  • Cellular structure – 70% closed cells
  • Weight of 750 ml can: 850 gms, sometimes cheap products avaialble fill lesser PUF in the can to reduce price.
  • Skin formation : 8-10 minutes 
  • Cutting time: 25- 35 minutes, affects productivity.
  • Fire rating: B1 or B3 , B1 grade is at least twice expensive than B3 grade since B1 is FR PUF- it retards fire upto 120 minutes and it duly approved after testing conducted by a reputed institite. Product data sheets can mention FR data however 3rd party test report for B1 grade is essential.
Is Gun grade PUF sealant better than straw grade pu foam can for door frame applications ?

Ideally, Gun grade is the better option than adopter/straw grade PU foam spray cans.


1. Gun type PU foam sealant is designed for lower expansion and high bond strength – this is essential for door frame fitment. Lower expansion ratio ensures that puf doesnt exert pressure on door frame, high bond strength improves structural strength of door frame. 

2. Gun helps in controlling the quantity of Puf used so the wastage is lesser.

Charactersitics  of PUF sealant

  • Single component product, doesn’t require mixing etc
  • mildly flexible, can withstand vibrations, building movements
  • Bonds all building material, high bond strength
  • high gap filling ability upto 50 mm or more – no sealant has this ability
  • Excellent stability ,doesn’t shrink, doesn’t sag on vertical surface
  • covers large area due to high expansion ratio
  • Excellent Thermal, electric, sound insulation

Door frame installation process 


A. Material Required

  • Water spray can
  • Supex Masking tapes
  • Brush 
  • Cutter
  • Spacers (optional)
  • Supex 100 PU foam sealant
  • PU Foam Gun Applicator and Cleaner (if you are using the Gun Grade version)

B. Applying Gap filling PU foam for door frame fixing

STEP 1: Preparation:

  • Keep a gap of minimum 10mm and maximum 20mm between  and door frame.
  • Substrates should be clean and free of dust and grease but can be moist.surface cleaning for pu foam sealant
  • Loose parts must be removed and if necessary primer must be used (e.g. old plaster)
  • Slightly humidify the surface & door frame before applying the foamgap fill pu foam water sprinkling
  • Use protective gloves
  • Shake can thoroughly for 30 seconds

STEP 2: Applying of PU foam spray sealant:

  • Hold the can upside down and extrude the  PU foam by pressing the bardoor frame pu foam sealant
  • Spray some extra water if you are filling a gap with some depth or if you are applying the foam in different layer.
  • PU foam sealant is a moisture curing product, it will cure by absorbing moisture from the air.  Spraying some water on the wall and  frame will fasten-up the curing process  and will give a better cell structure  (acoustic & thermal properties)

STEP 3: After applying PU Foam sealant

  • Spray some additional water on the applied PU foam on both sides of the frame
  • After use, clean the valve and tube immediately with Gun & Foam Cleaner
  • Cut the spoiled foam away after curing of PU foam (24 hours)
  • Let the foam cure for minimum 24 hours before putting the door in the frame

Important facts about Gap Filling PU foam spray:

  • Always store cans upright.
  • Store in a cool and dry place at temperatures between +5°C and 35°C
  • Never put a PU foam spray can in direct sunlight
  • PU foam spray sealant  is not UV resistant so it always needs to be covered with a sealant, paint or plaster.
  • Strong bonding characteristics
  • Excellent adhesion on most common materials and between different materials
  • Effective thermal and acoustic insulation
  • Wonderful filling capacities, expands to 40 times its original volume
  • Electric insulator
  • Environmentally friendly (CFC-free) propellant gas

FAQ’s on Door frame installation with gap filling PU foam spray

Is it necessary to moisten the surface before using expanding foam sealant ?

We recommend moistening because the system needs water to cure. Other benefits one will get: i. Better cell structure ii. Better adhesion iii. Faster curing iv. Better foam quality

Is there a negative effect on insulation spray foam sealant if the can is not shaken thoroughly prior to use?

Polyurethane spray foam consists of a prepolymer and a propellant gas, which form two layers during storage. The can must be shaken vigorously before use to create a homogeneous mixture. Insufficient shaking will result in poor foam properties such as a coarse cell structure and reduced foam volumes.

Does the Polurethane foam can need to be shaken again during use?

It is recommended to shake the PU spray can occasionally during use, and especially after interruptions, to avoid re-separation of the propellant & prepolymer.

Is it OK to leave half-empty canisters attached to applicator guns?

Yes; in fact we recommend leaving a partially-full container attached to the gun. To store the gun and pu spray can safely, the security screw should be tightened to secure the trigger.

What is the purpose of Remover? Can any other material be used?

Remover is used to clean the dispenser gun and the needles. The Remover can be mounted on the dispenser gun, thus cleaning the dispenser PUF gun more effectively. By using any other material the chances of damaging the pu spray gun increase.

How easily can a window mounted with PU Foam sealant be removed?

Window mounted with PU Foam sealant can be removed easily by slicing through the foam, but removal of the window by force is near to impossible.

Does the polyurethane foam spray sealant develop and exert pressure during expansion and curing?

Yes, the PU foam exerts a pressure during expansion and through hardening. It is therefore advisable to fill gaps and cavities by no more than one third.

What should I do with excess pu foam sealant such as that round doors and windows?

Cured excess polyurethane foam can be cut away with a knife, saw or any similar implement.

From where do I buy Pu foam spray in Mumbai / India

Anagha Engineers products are available in Mumbai and across India. Just call +919833892782 for best price, training and swift technical support. 

Which is the best PU foam sealant for door frame fixing available in India? 

Supex 100 PU foam –  gun grade or straw grade is a high yeild, versatile product manufactured with German technology.  Anagha Engineers has various PU foam sprays used for general industry, Solar, construction segments. 

When NOT to Use Spray Foam Insulation
  1. For areas that are too close to electrical boxes:
  2. For areas too close to ceiling light boxes: You should not use spray foam to insulate areas around recessed ceiling canister lights. …
  3. Open-cell spray foam on your roof: …
  4. For closed-cavity spaces: …
  5. If you have a history of skin, respiratory, or asthma problems:

How to contact Anagha Engineers application experts?

Call 9833892782 for:

  • Site demo
  • free samples
  • technical discussions
  • price
  • order 

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