framing a partition in a garage
I need to frame a section of my garage to make a room for a furnace.
This is a 40 year old garage attached to house on a concrete slab.
1) A neighbour warned me to leave a space between the top plate of the new partiton and the finished ceiling to allow for movement. The climate is hot summers and down to -20-25 in winter as the min. Do I have to worry about this?
2) what would be the best way to attach the top plate then
3) To attach the sole plate ( pressure treated wood) to the concrete would you reccomend a Hilti gun? or other means?
3) what kind of nails for the sole plate?