How To Insulate An Old House

How to Insulate an Old House

Insulating an old house can be a daunting task, but it’s important to ensure that your home is energy-efficient and comfortable. In this article, we will guide you through the process of how to insulate an old house.

Assess Your Home’s Insulation Needs

The first step in insulating an old house is to assess your home’s insulation needs. You can hire an energy auditor to evaluate your home’s insulation or do it yourself. Look for drafts and areas where insulation is lacking or damaged.

Types of Insulation

There are several types of insulation available in the market. The most common types are batt insulation, blown-in insulation, and spray foam insulation. Each has its pros and cons, and the best type of insulation for your home depends on your budget, climate, and other factors.

How to Insulate an Attic

The attic is one of the most important areas to insulate in an old house. Heat rises, and an uninsulated attic can lead to significant heat loss. Start by sealing any air leaks and then insulating the attic floor with either blown-in or batt insulation. If you have a finished attic, insulate the sloping walls and the ceiling as well.

How to Insulate Walls

Insulating walls can be challenging in an old house. If you have access to the walls, you can add blown-in insulation or batt insulation between the studs. If you don’t have access, you can consider insulating from the outside by adding a layer of insulation board and siding.

How to Insulate Floors

If you have a crawl space or an unfinished basement, insulating the floors can help prevent heat loss. Insulate the floor joists with either batt insulation or rigid foam insulation. If you have a slab foundation, insulate the perimeter of the slab with rigid foam insulation.

How to Insulate Windows and Doors

Windows and doors are common areas for air leaks. Seal any gaps or cracks around them with weatherstripping or caulk. You can also consider adding storm windows or doors for extra insulation.


Q: How much does it cost to insulate an old house?

A: The cost of insulating an old house depends on several factors, including the size of your home, the type of insulation you choose, and the condition of your existing insulation. On average, expect to spend between $1,500 and $4,000.

Q: Can I insulate my old house myself?

A: Yes, you can insulate your old house yourself, but it’s important to do it properly. Follow the manufacturer’s instructions carefully and take safety precautions, such as wearing protective clothing and a mask.

Q: Will insulating my old house save me money on energy bills?

A: Yes, insulating your old house can help reduce your energy bills by preventing heat loss and air leaks. It can also make your home more comfortable and increase its resale value.


Insulating an old house can be a significant investment, but it’s worth it in the long run. By following the steps outlined in this article, you can make your home more energy-efficient, comfortable, and valuable. Remember to assess your home’s insulation needs, choose the right type of insulation, and properly insulate the attic, walls, floors, windows, and doors.