I m not a big fan of running water pipes in unheated spaces but if you must run the hot water pex up in the attic keep the pex tubing down tight to the ceiling and encapsulate in foam tubing insulation.
How to insulate pipes in unheated attic space.
Insulating exposed pipes is an important step in getting your home prepared for the winter.
But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates.
For corner joints that need to be insulated cut a simulated miter joint by cutting the insulation at a 45 degree angle.
Continue this process over the entire length of piping in your attic.
Often inexpensive foam pipe insulation is enough for moderately cold climates.
If the air distribution is in the attic space then consider insulating the rafters to move the distribution into the conditioned space.
For severe climes opt for wrapping problem pipes with thermostatically controlled heat tape from 50 to 200 depending on length which will turn on at certain minimum temps.
In unfinished attic spaces insulate between and over the floor joists to seal off living spaces below.
For the center areas hold the hose level and blow in insulation evenly until you ve reached your level lines photo 6.
Then take the attic insulation and put that on top of everything with the vapor barrier toward the ceiling and that should be ok for you.
Move across the attic until you ve hit your desired height at every point.
Plan to pull up the flooring and layer new insulation on top of the old.
But plumbing pipes in an unheated area such as an attic crawl space and garage are at risk of freezing.
Blow in insulation until the hopper is empty.
Then pivot in place and do the same thing to the other side.
Open the insulation piece at the slit and slide it over the pipe.
Once you locate the pipes take the insulation and cut it into sections using the utility knife in order to easily slip it over the pipe.
Fiberglass batts are the easiest insulation to add to unheated spaces.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.