I have what I think is a very well built house/garage that was built in the mid 1950's ranch style. Below is a specific example of my garage and the issue at hand.
The Ceiling joists are true 2x12's connected to 2x6 Rafters. I want to hang storage shelves and a Lift system (Pull no more than 500lbs) using Lag Screws directly into the bottom of each 2x12. Images are below for a better idea.
The debate centers around 2 things.
1. The Ceiling Joist to Rafter junction is compromised since the Joists are reduced down to about 4 inches at the end tip of the Joist at most outside portion the wall plate and cannot handle ANY additional load beyond the roof system and the 2 existing Garage Door openers.
2. 7/16" x 3" inch Lag bolts would pull out of the 2x12 Ceiling joists with the 500 lbs lift system. There are 12 Lag Screws attaching 4 Steel Unistrut Rails (3 each) in this system now.
My position is that this construction is far superior to current framing I see today but I would also like some sort of idea of loading abilities of this construction system.
The Unistrut Rails tie in the 3 Ceiling Joists and share the 500lb load. With 12 Lag Srews, each is only taking on about 41.5 lbs each or 125 lbs per ceiling joist, Right?
The Ceiling Joists are 16" on center with a 20ft span. The lift system is about 4 ft from the outside wall of the Garage.
I make no pretenses that I have any knowledge about engineering and would greatly appreciate input from experienced framing expertise to help decide to move forward or pull down the lift system and not use it?
The Ceiling joists are true 2x12's connected to 2x6 Rafters. I want to hang storage shelves and a Lift system (Pull no more than 500lbs) using Lag Screws directly into the bottom of each 2x12. Images are below for a better idea.
The debate centers around 2 things.
1. The Ceiling Joist to Rafter junction is compromised since the Joists are reduced down to about 4 inches at the end tip of the Joist at most outside portion the wall plate and cannot handle ANY additional load beyond the roof system and the 2 existing Garage Door openers.
2. 7/16" x 3" inch Lag bolts would pull out of the 2x12 Ceiling joists with the 500 lbs lift system. There are 12 Lag Screws attaching 4 Steel Unistrut Rails (3 each) in this system now.
My position is that this construction is far superior to current framing I see today but I would also like some sort of idea of loading abilities of this construction system.
The Unistrut Rails tie in the 3 Ceiling Joists and share the 500lb load. With 12 Lag Srews, each is only taking on about 41.5 lbs each or 125 lbs per ceiling joist, Right?
The Ceiling Joists are 16" on center with a 20ft span. The lift system is about 4 ft from the outside wall of the Garage.
I make no pretenses that I have any knowledge about engineering and would greatly appreciate input from experienced framing expertise to help decide to move forward or pull down the lift system and not use it?