blackout

I have a storefront east and west windows non tempered. They want to put up shelves in front of the windows and want the windows blacked out so the shelves aren't visible from the outside. They want to put the film partially up the windows about halfway. They go up about 8 ft but they just want them tinted 4 ft up so light can come in above the shelves. There are also 34x33 windows bel;ow the big ones that they want fully blackedout..I did another store like this about a mo ago and as far as I know no problems..should I do it? I warned them about glass breakage. I'm in San Diego so it rarely gets above 100C but it does somethimes and these shelves will block and circulation to cool the glass..what would you do? thanks I don't want to put blackout on the exterior cause it won't last..I know the answer is black vinyl but they want it inside..

I had a job like this a month ago. Initially we put on 15% daylight natural because of the glass breakage issue. After 3 days the company called us back saying the film was too light and they wanted to completely blackout the windows instead. The windows get direct sunlight all afternoon so we told them that it couldnt be done with a warranty and the glass may break and the seals will most likely fail. They didnt care because they wanted to cover up shelving as well. We went ahead and did the windows and havnt had an issue so far.

No mention of single or double pane ? Storefront is generally single , annealed. Except on the newer upscale developments ,and they are usually tempered . I do a ton of BO film and it gets over 100 ,east ,south,west exposure. Shouldn't be a problem.
You might want to check if they have had glass brkge. problems before, alot has to do with how good the glass guy did on his cuts.
If he chips the glass or leaves a clamshell , that would cause a prblm.
All glass is not created equal.

BP gas stations do this with vinyl all the time. I never seen a broken out storefront yet.

I'd advise them of the potential for trouble and let them decide if they want to take the risk. By the way - installation of BO film to just half of the glass increases the risk of breakage since heat and stress would be different on different parts of the glass.

Going only halfway creates uneven heat absorbtion. Asking for trouble. Maybe try whiteout or a matte film...

i would have to agree with BD and V

They have another corner of the store with b/out half way and they want it top match..This is corporate so too much trouble to talk to someone who can change the deal..Thanks for the help all