Before You Begin
Check the condition of the siding and framing to see if it needs to be repaired or replaced. If necessary, do the work before applying new caulk. Tighten loose nails with a hammer and nailset.
Inspect the caulk around the frame and if it has become brittle or pulled away from the joint, use a chisel to remove it. Clean out the joint carefully and use an old paintbrush to dust out the joint so it's perfectly empty.
It takes a steady hand and concentration so practice first. Before starting your project, run a trial bead on some scrap material to get accustomed to the sealant application rate.
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Step 1 : Load the caulk gun with cartridge
Cut off the tip of the caulk tube at an angle and load it into the gun. To operate the gun compress the handle so it is comfortable working with the mechanism released, then apply the caulk with a shorter handle movement.
Step 2 : Apply the caulk
Seal the joints between trim pieces of a window by holding the gun steady as you carefully release the caulk in the joint.
Step 3 : Apply caulk to siding
Carefully direct the caulk into the joint between the siding and window or door framing to seal the space and prevent leaks.
Step 4 : Seal the window framing
Use caulk to seal the gap around the outside of a window frame where it meets the siding. Apply gentle pressure, don't force it.
Step 5 : Seal deep gaps with foam
If there is a gap wider or deeper than 1/2-inch, use a foam insulation first to fill the gap, then cut away the excess after it has hardened. Finish the joint with caulk.
Step 6 : Caulk inside
To fill gaps inside the house where wallboard meets doors and windows, run a bead of caulk down the joint and then immediately wet your finger (slightly) and smooth the bead to give it a neat finish.