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30 x 40 Post Frame Garage | Layout + Footings

Updated: Dec 19, 2023

Today, I'm introducing a 30 by 40 three-car garage that we're building post-frame style. It's pretty straightforward, with three garage doors, two windows on each end, and a back access door. The garage will have in-floor radiant heat, and we'll pour a concrete floor. We've just received the material delivery with purlins, girts, bottom-grade boards, wet-set brackets, universal corner brackets, various trims, steel, laminated columns, and trusses. After everything is unpacked, it's time to decide on the building's placement and mark it out.

Squaring up a building with string lines

Once we've squared up the building with the home, and the corners match up, we'll lay batter boards to set up string lines and mark the footings. This process ensures we have precise footing locations.

Once the initial layout is complete, we make adjustments based on the client's preferences. The new site is then considered thoroughly prepared. We complete the drilling of all the footings. We have to set up forms and then prepare for the concrete pour.

drilling holes for footings

The footings are then poured, and the string lines need set back up, ready for marking the locations of the wet-set brackets. We're using eight wet-set brackets for the front, and they'll be universal brackets dry-set, with corner brackets at the building's corners.

We've marked the brackets, ensuring accurate placement. We also need to add height to some of the brackets due to the insulation and concrete depth.

Now we're nailing 60-penny nails into the ground to help us set up string lines and provide accurate dimensions for the building. This ensures our measurements are precise for future work.

wet-bracket install

Once all the footings are poured, and the wet-set brackets are installed, I'll proceed to mark the locations of the dry-set brackets, which are not as critical as they'll be easier to adjust in place.

For locations without wet-set brackets, we mark the outside edge of the posts on the footings, ensuring accuracy during construction. It helps in positioning the posts precisely and speeds up the building process.

The concrete solidifies quickly, and we need to let it cure for 48 hours. While we wait, we'll lay out the posts, mark the girt locations, nail on the girts, and assemble the two longer walls on the ground. Then, once the concrete is dry, we'll be ready to start erecting the walls and installing the dry-set brackets.

Thank you,

MR Post Frame

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