Originally Posted by millertimeUS
Did you screw it directly into the skin? Are the aluminum spacers sitting on the skin or did you put a rubber isolator? What tool did you use to cut the lexan?
Can you detail the process? Did you use a template (Luan perhaps?) and then cut the lexan?
Thanks for the share!
Sent from my iPhone using Airstream Forums
76 'Airstream Tradewind
it is screw to the window trim....that is itself attach to the skin so it s a much ticker aluminum attachment than the skin only. it does take a lot of force to screw into it. absolutely no way the attachment will ever come loose or unscrew.
I started by cutting larger rectangle lexan using a skill saw and a very fine new metal blade. the cut is clean and very easy. i then put the lexan against the window and screw it directly to the window without any spacer. i had the predetermined holes drilled in the window trim.
To screw the lexan..i first used a fine bit to make a hole....it s safe and dost crack...then, i increase the hole size as much as needed so the screw will never touch the lexan once i finish the installation with washers...
Once my rectangle was attach to the window, i simply use a black marker to trace the shape i wanted.... unscrew everything and cut to final shape with skill saw making sure i tape everywhere on top of the lexan to not make any scratch with the saw.
finally...reinstall everything with the cylinder spacer and the lexan is trapped between 2 spacer. using 3/16 thickness lexan...it became very clear after a few attachment point that the structure would be extremely stiff and solid. there is no give or movement....i can put all my weight and push on the rockguard and it barely give in a few mm....so i feel pretty confident it can stop any rocks.
i have some final trimming to do plus installing the middle piece. i might go ahead and add some small rubber washer between the washers and lexan to give it even more float movement for expansion/shrinkage during hot cold weather.
from the inside....you simply cant tell there is a rockguard... it s 100% invisible so i m happy about that...i like the panoramic view from the bed!
PS: your idea of using luan to make the proper shape would be very good...i should have though of something like this. i tried with cardboard but it was too flimsy. it s hard to use the lexan to find the perfect shape when you want to avoid any scratches....