Those big screw heads in the threshold of a newer entry door aren’t just decorative; they raise or lower a narrow strip set in the threshold. So if you’ve noticed a draft under the door, try this: On a sunny day, turn off the lights and close nearby curtains. Lie down and look for daylight under the door. A sliver of light sneaking in at both corners of the door is normal. 

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Original Article Source Credits: Family Handyman , https://www.familyhandyman.com/

Article Written By :  Elizabeth Flaherty

Original Article Posted on : : Apr. 01, 2020

Link to Original Article:  https://www.familyhandyman.com/diy-advice/home-maintenance-projects/