My House has large gable vents that I would like to close up to prevent
heat loss this winter. What do you suggest I use?
This is not a good idea - Don't do it! The best way to prevent heat loss
is to add insulation and foam seal the gaps in the wall where pipes and
wires pass into the attic. Once any heated humid air escapes to the attic
you will want to direct it out of the house as quickly as possible through
the ridge and gable vents. Blocking these vents restricts airflow and
allows condensation to form in the attic.