How to insulate a wall to avoid heat, noise or humidity

Every year, the same thing happens to us: we're already thinking about summer and vacation, and suddenly we remember the heat we endured the previous year. If you're one of those people who isn't keen on the heat, you'll surely think insulating your home's walls to keep out the heat is a great idea.

Insulating your home's walls is one of those things that, once you do it, you wonder why it took so long. Especially in summer, when the heat is on and keeping your home cool becomes an ordeal.

In this guide, we'll tell you how to insulate a wall step by step, what waterproofing is, and how to properly waterproof it to increase comfort and save energy.

Why it is worth insulating a wall in summer

When we talk about thermal insulation, many people think of the cold of winter. But the truth is, it's just as important in summer, if not more so. Knowing how to properly insulate a wall helps keep outside heat out of the home, maintaining a comfortable temperature without overusing the air conditioning.

Some benefits of knowing how to insulate a wall to keep cool during the warmer months are:

• Reduce the entry of outside heat.
• Improve interior comfort.
• It allows you to save on your electricity bill.
• Prevents materials from suffering from high temperatures.
• Protects against damp and mold when combined with a good waterproofing product.

What is a waterproofing agent and when should it be used?

If you're going to be working on exterior walls, it's not only important to know how to insulate a wall, but also to understand what waterproofing is.

A waterproofing product is a product applied to surfaces to prevent water and moisture from penetrating. Available in liquid, paint, and self-adhesive sheets, these waterproofing products are used on facades, roofs, and walls that come into contact with the exterior.

Using a waterproofing agent is essential if you want your thermal insulation to last and function properly. Installing insulation is of little use if the wall has water leaks or internal condensation.

How to insulate a wall from the inside step by step

If you can't work from the outside or simply prefer an easier-to-apply solution, knowing how to insulate a wall from the inside is a good option. Let's walk through the steps:

1. Evaluate the wall: check for cracks, moisture, or peeling paint. If so, it will need to be fixed first.
2. Clean the surface well : a clean wall is key for materials to adhere well;
3. Install insulation panels : you can use rock wool, polystyrene, cork or reflective panels, depending on your budget and available space;
4. Cover with plasterboard or similar : this protects the insulation and leaves a good base for painting;
5. Finish and paint : You can now paint or wallpaper the wall however you like.
6. How to insulate a wall from the outside

When you can access the exterior of the wall, external thermal and acoustic insulation is the most efficient option. It prevents thermal bridges and better protects the structure. The most common solutions are:

• SATE systems : these are insulating panels that are glued and covered with a protective layer;
• Thermal coatings : a heat shield like the special Fisher one that reflects heat;
• Ventilated facades : more complex, but very effective in very hot areas.
• How to waterproof a wall correctly

Knowing how to waterproof a wall is almost as important as insulating it. Because if it's not properly protected from moisture, heat won't be the only problem.

Steps to do it right:

1. Clean the surface well.
2. Repairs fissures, cracks and poorly sealed joints.
3. Apply a primer if the manufacturer indicates it.
4. Use a suitable waterproofing agent (liquid, paint or film).
5. Let it dry well before applying the thermal insulation.

Recommended products for insulating and waterproofing walls

There are many options, depending on the type of wall, the climate, and your budget. Some ideas:

• Mineral wool : effective, ecological and with good thermal and acoustic insulation.
• Polyurethane foam : fast-acting and with great insulating capacity.
• Sprayed cork : natural, light and breathable.
• Waterproofing paints : ideal for exteriors.
• Liquid membranes : easy to apply and very durable.

Common mistakes when insulating or waterproofing

• Not fixing dampness or cracks first.
• Using materials that are not suitable for every type of wall.
• Failure to respect drying times.
• Incorrectly placing the insulators and leaving gaps.
• Do not protect the wall with a prior waterproofing.

Expert advice for warm areas

• Choose materials that also serve as a sun barrier.
• Combines insulation and waterproofing for durability.
• Use light colors outdoors to reflect heat.
• Make sure the system you choose is breathable to prevent condensation.

When to call a professional

Sometimes it's better to leave it in expert hands, especially if:

• There is presence of structural humidity.
• You need to insulate entire facades.
• You are looking for a guaranteed technical solution.
• You want to access subsidies or energy certificates.

Waterproofing is easy, if you know how

Now that you know how to insulate a wall, what a waterproofing agent is, and how to waterproof it effectively, you're one step closer to turning your home into a cool and pleasant haven this summer. Remember, it's not just about lowering the temperature a few degrees: you'll also gain in health, well-being, and long-term savings.

And if you're not sure where to start, ask for professional help. At Brikum, we can guide you from the start to ensure you get the best hand tools, equipment , and construction materials for your home improvements.