University of Missouri Extension

GH5936, Reviewed October 1993

Simple Home Repairs: Caulking and Filling Cracks Around Windows and Doors

Patricia Klobe
Department of Environmental Design

High heating and cooling bills; moisture, dust, and dirt coming through cracks; and insects entering the house signal that it is time to caulk your windows and doors.

What you will need

Caulking cracks and holes (non-masonry)

Between window and door frames and the main frame of the house

Between window and door frames and the main frame of the house

Gaps in sidings and at corners of house

Gaps in sidings and at corners of house

Joints formed by siding and masonry

Joints formed by siding and masonry

The underside of eaves where wall and eave meet

The underside of eaves where wall and eave meet and the surface of wood siding, trim and fascias.

The joints where steps and porches meet the house

The joints where steps and porches meet the house

For holes in wood surfaces, use putty and apply with a putty knife

For holes in wood surfaces, use putty and apply with a putty knife.

Filling masonry cracks


Hold the trowel at a 45-degree angle to the jointYou can make the V-shape with the tip of the pointing trowel. Hold the trowel at a 45-degree angle to the joint, push the tip into the joint and then firmly move the trowel along the joint (Figure 11).


A special masonry tool called a jointer Place the jointer over the mortar joint lengthwise and press the mortar firmly into the joint to form the concave shape

You'll need a special masonry tool called a "jointer" to make a concave joint (Figure 12). Place the jointer over the mortar joint lengthwise and press the mortar firmly into the joint to form the concave shape (Figure 13).

Your benefits

Your house will be more air-tight, lowering the heating bill, getting rid of the insects and preventing moisture damage.

This guide was reprinted from the United States Department of Agriculture publication, Program Aid number 1193, Extension Service.

GH5936, reviewed October 1993

GH5936 Simple Home Repairs: Caulking and Filling Cracks Around Windows and Doors | University of Missouri Extension

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