Saturday, September 30, 2023
Home Wall Insulation: The Complete Beginner's Guide

Wall Insulation: The Complete Beginner’s Guide

It is essential to living in a healthy home, and installing wall insulation to the structure can improve your home’s comfort. Insulating your home, which keeps it warm during the winter and cool in the summer, is one of the most effective ways to preserve energy.

You may insulate your walls from the outside, the inside, or both. In this post, we’ll go over everything you need to know about wall insulation, including what it is and why it’s important.

What is Internal Wall Insulation?

Internal wall insulation is a highly efficient way to create a stable and reliable lifestyle by preventing exterior temperature variations from impacting your home’s interior. It is particularly important in a place where the weather varies greatly from season to season. 

If a property has solid walls, you may use an internal wall insulation option. Cavity wall insulation may not be suited for concrete walls despite brick walls; cavity wall insulation may be acceptable for solid walls. In general, the walls of a home absorb around 35% of the heat, so appropriate insulation installation can help you save money on energy costs while also maintaining a more stable temperature.

Why is it Necessary to Insulate Internally?

  • To comply with the Decent Homes Standard
  • Heat loss is reduced.
  • It will maintain the heat inside your house.
  • Lesser power costs due to lower energy use.
  • It also serves as a sound barrier.

What is External Wall Insulation?

External wall options include a protecting render or aesthetic treatment over an insulating layer attached to the actual wall. Dry cladding comes in a variety of finishes, including wood panels.

Buildings with poor insulation could lose more than 35% of their heat through the walls. External wall insulation reduces heat loss dramatically, resulting in a 25% reduction in annual fuel costs. External wall insulation also preserves the building’s structure, avoids decay, and reduces thermal bridging and condensation problems. In a newbuild, EWI systems are the most cost-effective way to fulfil current and future thermal performance demands for building regulations, resulting in an interior environment with minimum temperature changes and lower heating value needs.

Why Is It Necessary to Insulate Externally?

  • To comply with the Decent Homes Standard.
  • Improves the building’s thermal efficiency.
  • Moisture/condensation problems are no longer a concern.
  • The existing building envelope is protected.
  • It saves you 25% on your heating expenditures.
  • Enhances the look of the structure

How to Select the Proper Insulation

If you want to improve the condition of your basement, experts can assist you in finding the best option. Spray foam, fibreglass, and foam board are the most prevalent insulating materials. We’ll go through each item in detail later. The following are some things you should know before choosing the right insulation for your property.


  • Compared to other basement insulation solutions, fibreglass is a less expensive substance.
  • Fibreglass may be installed as a DIY job if you wish to repair your basement yourself.
  • In the cellar, fibreglass does not act as a moisture barrier.
  • Since fibreglass batts are porous, they don’t defend your home from warm, moist interior air hitting the surface of the basement wood studs.
  • It may result in issues with humidity and wetness.
  • If disturbed, it could release particles in the air that might penetrate the skin or enter the airways.

Spray Foam

  • Spray foam is certified, which means it is safe for the environment.
  • Mould and mildew cannot develop in spray foam insulation.
  • Spray foam insulation is much more costly than other types of insulation.
  • It demands the involvement of skilled experts.
  • Spray foam produces an air barrier that prevents outside air from entering.
  • Sound is kept out of the home thanks to open-cell spray foam.

Foam Board Insulation

  • There are water-resistant rigid foam solutions on the market that may prevent moisture accumulation and mildew development.
  • The stiff material may produce an air barrier if foam board insulation is installed appropriately.
  • There are durable foam boards components that you won’t just have to keep or replace over time.
  • If the foam boards aren’t correctly taped, they won’t allow ventilation.
  • The air bubbles within the foam boards may collect moisture and become useless.
  • The foam boards must be trimmed precisely to suit the region to be correctly fitted. If a-boards are not cut perfectly, air leakage might develop.

Ways to Improve the Insulation of Your Walls

The following are some suggestions for improving the insulation of your walls:

Fibreglass Batts Should Be Cut to Exact Widths

For a perfect fit, measure and cut the fibreglass batt. To guarantee a tight fit, add around 1/4 inch to the measurement. To guide your utility knife, use a 4 to 6-inch-wide board or piece of plywood as a straightedge.

Stuffing Isn’t a Good Idea

Full-width batts should not be crammed into too-tight spaces. If batts are crushed to fit into narrow locations, uninsulated air pockets are formed.

Put On Your Safety Gear

Before dealing with fibreglass, take precautions to protect your skin, eyes, and lungs. You should probably wear a disposable coverall if you’re going to be doing much of it.

Foam Sealing Narrow Gaps

Using expanding spray foam, seal around window and door jambs. The primary objective of the spray foam is to prevent air intrusion by closing the area surrounding the window.

Wall insulation is essential for a house or building’s comfort and energy efficiency. It’s also far more expensive to keep a house warm during the winter and cool during summer if you don’t have it. High wall insulation batts also decrease draughts, maintain a more uniform and consistent interior temp, and help improve air quality and moisture levels, lowering the danger of sick building syndrome for residents.

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