In the winter when the air is drier and there is less humidity the vents could be closed so that the water and sewage pipes wouldnt freeze. The simple answer to the question above is.
Otherwise keep them open when the temperature is consistently above freezing to avoid moisture-related problems.
Should crawl space vents be closed in winter. If you must close your vents during winter I highly encourage you to do it only when the temperature drops below 32⁰. So the idea of venting a crawl space was born. So no since your home was built in 1990 I would advise you to keep your foundation vents open in the wintertime.
As long as you have a moisture barrier down on the floor of the crawlspace and you are having no moisture problems you do not need the vents open in the winter. In short the answer is generally yes they should be closed up during the winter months. Those crawl spaces generally have the worst insect and rot damage.
First and foremost open vents allow moisture to enter your crawl space. Hope this helps John Hill. The traditional line of thinking is the vents should be open in the summer and closed in the winter.
During hot weather the vents would be left open to allow outside air to circulate in the crawl space which would theoretically cool the rest of the house. Venting your crawl space leads to a variety of issues. My old house I sealed the crawlspace vents with foamboard cut to fit in the vents from the outside.
It is therefore advantageous for homeowners to open up their crawlspace vents in the winter to allow the cooler dryer air to passively infuse into the crawl space flushing out all of the moisture that builds up during the summer months. Open and close crawlspace vents seasonally In the winter when the air is drier the vents are closed to reduce the chance that the pipes in the crawlspace might freeze. The other advantage to closing your crawl space vents throughout the winter is it helps keep the wet air out during rainy weather.
Still have more questions about your crawl space. When temperatures drop below the freezing point water pipes in the crawl space are bound to freeze if the vents remain open. Why take this measure.
To control the humidity you open the crawl vents in the winter to allow the warm moist air to flow naturally to the cooler drier outside environment. When the vents are closed moisture can build up in the crawlspace and lead to moisture-related issues such as fungal growth and deterioration which no homeowner wants. One of the major debates in the world of crawl spaces these days is how to make use of the vents.
You want to keep out the cold winter air from reaching your pipes. Its a good practice to close off the vents in winter. I recommend that in any crawlspace where the floors are insulated that the vents be open at all times for air circulation.
Now most people close their crawl space vents in the wintertime to keep the cold out so that the cold air doesnt freeze the pipes under the house. Just about anything you can do to separate your crawl space from frigid exterior conditions is a good idea. How to Close Foundation Vents in the Winter The simplest way to close foundation vents for the winter is to plug them from the outside with foam blocks made specifically for this purpose.
So if your crawl space is musty dirty and contaminated with mold so is your home. Although the original intent was for the air from outside to dry out the crawl space in actuality the moisture or extreme temperatures brought in do more harm than good. There is a better answer – sealing your entire crawl space against Mother Natures wrath.
So our answer is to open and close the vents in your crawlspace seasonally instead of deciding to seal off crawl space vents altogether. Should I close my crawl space vents in the winter. The safest and most commonly accepted code for any home is to leave crawlspace vents in place year round.
However this doesnt mean that closing the vents is the solution to all of your winter crawl space concerns. However there are a few things you can do to help combat those cold winter floors and reduced heating inefficiency due to drafts. Your crawl space vents should always be closed and sealed off from the outside elements.
In the winter when the air is drier the vents are closed to reduce the chance that the pipes in the crawlspace might freeze. Ventilating your crawl space has been proven not to work. Should I close my crawl space vents during winter.
So our answer is to open and close the vents in your crawlspace seasonally instead of deciding to seal off crawl space vents altogether. Doing so prevents the dry cold winter air from freezing the pipes inside the crawl space. But when you add humidity to the equation this is a very poor decision for the overall health of your crawl space and home because it doesnt have any effect at all on controlling humidity.
You should always close the crawl space vents in your home before winter sets in. In winter when the air is drier the vents are closed to reduce the chance that the pipes in the crawl space might freeze. In the summer you close the vents to keep.
However the right answer is very clear. If you follow our Monthly Maintenance Schedule we recommend the month of October as a good time to do this. Did that for 20 years without problems.