Posted: Jan 24, 2017 How To Determine If You Need Snow Retention For Your Home's Roof By Brandon Jensen Are you hearing loud noises coming from your roof? This can be a sign that snow is sliding. Beware the next time you open the door to go outside especially if your door opens where snow falls. Deaths have occurred when snow slippage is imminent and someone slams a door. Just the vibration creates an avalanche.