How to Insulate a Loft Hatch

How to Insulate a Loft Hatch | Insulation King


As homeowners, we’re often on the lookout for ways to improve energy efficiency and reduce heat loss within our living spaces. There is one often overlooked area which can be a significant source of heat loss if not properly insulated: the loft hatch.  

Alongside letting heat escape, an uninsulated loft hatch can also contribute to draughts, allowing chilly air into your home and causing your heating system to work harder than necessary to maintain a consistent temperature.  

Fortunately, with a few simple steps, you can effectively insulate your loft hatch, contributing to a more energy-efficient home and potential cost savings on your energy bills. In this guide, we'll walk you through the process step by step, providing practical advice for a successful insulation project. 

Materials You’ll Need 

Before you begin, gather the necessary materials: 

  1. Insulation Material: For this guide, we’ll look at insulating a loft hatch with our most popular loft insulation materials: Superglass Multi Roll, ROCKWOOL Flexi Slab, and ROCKWOOL Twin Roll 
  2. Adhesive or Tape: To secure the insulation material in place. 
  3. Measuring Tape and Utility Knife: For precise measurements and cutting the insulation material. 
  4. Safety Gear: Use gloves, goggles, and a mask to protect yourself during the process. 

Your Step-by-Step Guide to Insulating Your Loft Hatch  

Step 1: Prepare the Area 

Start by clearing any items stored near the loft hatch to create a safe and accessible workspace. Ensure there's enough room to move freely around the hatch. 

Step 2: Measure the Loft Hatch 

Use a measuring tape to determine the dimensions of the loft hatch. Measure both the length and width accurately and mark these dimensions on the insulation material to cut to the right size.  

Step 3: Cut the Insulation Material 

The method to cut the insulation material can differ depending on the specific material:  

Superglass Multi Roll: 

Use a sharp utility knife to carefully cut the Superglass Multi Roll along the marked lines. 

ROCKWOOL Flexi Slab:  

Instead of cutting all the way through, score the Flexi Slab along the marked lines using a sharp knife or blade, applying enough pressure to create a groove. Once scored, gently bend the Flexi Slab along the scored line to create a clean break along the dimensions. 

ROCKWOOL Twin Roll: 

Similar to Flexi Slab, score the Twin Roll along the marked lines with a sharp knife or blade. Apply firm and steady pressure along the scored line to cut through the material, ensuring a clean and precise cut.  

Be sure to double check the measurements before cutting to avoid any mistakes!  

Step 4: Attach the Insulation  

Again, the method to attach the insulation material can differ: 

Superglass Multi Roll: 

  1. Place the cut Superglass Multi Roll insulation material onto the loft hatch cover, ensuring it covers the entire surface area. 
  2. Apply a suitable adhesive to the back of the Superglass Multi Roll or directly onto the loft hatch cover. 
  3. Press the insulation material firmly onto the hatch cover to make sure it adheres securely. For optimal insulation, be sure to smooth out any wrinkles or air pockets.  

ROCKWOOL Flexi Slab & ROCKWOOL Twin Roll  

  1. Accurately align the cut material onto the loft hatch cover, covering the entire surface area.  
  2. Use an adhesive or tape suitable for ROCKWOOL materials, like our ROCKWOOL Acoustic Intumescent Sealant 310ml, to fix the material to the hatch. Alternatively, you can also use fasteners. 
  3. Press down firmly on the insulation, ensuring a snug fit around the edges and corners of the hatch to prevent heat loss.  

Step 5: Seal Any Gaps  

Inspect the edges of the loft hatch and seal any remaining gaps or cracks with additional insulation material, adhesive, or sealant. This step is crucial in preventing heat from leaking out. 

Step 6: Test the Insulation  

After insulating the loft hatch, conduct a simple test by feeling around the edges for any draughts. If you notice a significant reduction in airflow, congratulations! You’ve successfully installed your loft hatch insulation.  

Additional Tips: 

  • Consider using weather stripping around the edges of the loft hatch for added insulation. 
  • If you use your loft hatch often, opt for insulation that allows easy access, such as insulating jackets that can be easily removed and replaced. 


By insulating your loft hatch, you're taking a significant step towards improving the energy efficiency of your home. Not only does it contribute to a more sustainable living space, but it also helps reduce energy bills by preventing heat loss. When you follow these simple steps to insulate your loft hatch, you can enjoy the significant benefits of a well-insulated home.  

If you’re looking for some more guidance, don’t hesitate to get in touch with our experts – we're happy to help! 

DISCLAIMER: The contents of this guide are intended for information purposes only. Insulation king shall not be liable, answerable or accountable for any loss or damage resulting from the advice given.

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