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3m makes a film, sorta like tint that covers it. Ive seen it stop 2x4s in tornado/hurricane force winds and IIRC they make some that will also stop bullets
3M security film looks like really good stuff. Relatively bullet resistant and decidedly rock/baseball bat resistant. Unfortunately I don't think it's sold directly to people - the only places I've found that sell it are the "Contact us to discuss your security needs and a quote" type places.
The 3M Film is intended to stop 2x4's from penetrating past the window, but the glass will still break and shred but will stay together to hold the 2x4. But look at the specs for the 3M Film - its meant for up to Category 1-III winds. 110mph winds are puny compared to the muzzle velocity of a rifle bullet.
You know how fast a rifle bullet travels? 3025fps at 78' from muzzle for M855 5.56 62gr projectile (from
http://www.gun-shots.net/ballistics-chart.shtml).
3025 feet per second equates to 2062.5 miles per hour.
I GUARANTEE your 2x4 stud walls covered with vinyl siding or brick and insulated with fiberglass R13 insulation won't stop even a 5.56mm rifle bullet for long. Neither will your thin gauge steel security doors or aluminum storm shutters.
YOUR BEST BET IS DISTANCE TO TARGET (Your House) and an early warning system. Buy land - about 25 acres square and put your house exactly in the middle. If its a square chunk of land, the closest distance from your property line to your house will be 500 yards. Still not far enough for a 7.62 or a 50BMG, but you'll have early warning if you set motion detectors at the property line.
Just a thought. Either way, I really don't think any wood-stud brick veneered house is bulletproof.
Then again... a house built out of 12 inchreinforced concrete will stop everything except a 50BMG. It stops hurricanes for sure. I know - I live along the TX Gulf Coast.