Installation Guide
©2015 Trinity Glass International, Inc. 
DOC1INSF 6/15 
1 
FIBERGLASS DOOR SYSTEM 
Installation Instructions 
Thank you and congratulations. You have just 
purchased a premier fiberglass entry door system. If 
you have purchased an unfinished door system, we 
recommend that you paint/stain before installation. 
Refer to the finishing instructions section in this 
document. Please follow the instructions carefully for 
proper installation.  
CAUTION: Some door units are heavy and may 
require two people to lift and install. Use proper 
lifting techniques and follow safe working practices. 
Tools and materials needed: 
Tape measure, Hammer, Square, Level, Wooden shims, 
#3 Phillips screwdriver, #8 x 3" Exterior grade wood 
screws, Power drill with Phillips drill bit, Safety glasses, 
Caulking gun, quality clear exterior sealant, Putty 
PARTS OF A DOOR SYSTEM 
Before you begin: 
1. Do not remove the plastic door plug until instructed 
to do so. This is used to keep the door system closed 
and aligned. If the door unit has handles on the latch 
and hinge jambs, remove them. Also, cover the door 
sill to protect against harmful particles or scratches 
during installation or between a long period of building 
construction and occupation. Note that any contact 
with wet cement or cement powder will damage the sill 
finish. 
2. Make sure that the new door will properly fit in your 
frame opening. The recommended rough opening is 
3/4" wider and 1/2" higher than the door prehung unit. 
Resize the opening if needed. Verify that the frame 
opening is level, square and plumb. It is important that 
the floor is level. Minor out of level conditions at the 
sides and top can be corrected by using shims but 
major misalignments need to be corrected before 
installation. Diagonal measurements must be equal to 
within 1/4" (as shown below). Note that the latch jamb 
should be adjusted for plumb so that the weatherstrip 
on the latch jamb is evenly compressed when the door 
is closed. Use a Carpenter’s square and level to check 
for squareness, level and plumb of the frame opening. 
hinge 
brickmold 
door sill 
hinge 
jamb 
latch 
jamb 
head 
brickmold 
door sweep 
head jamb 
latch 
brickmold 
Square 
Level 







