If you have two or three bird venting holes along the outside of your roof line these are a great way to ventilate your attic along with gable ventilation on each end of the roof end.
The problem lies in that the builders and insulation contractors or any other contractor for that matter essentially do not talk to each other. That is the cause for hot rooms, poor airflow, unless art heat gain into your home and high utility bills but I digress. The lack of communication and just poor practices or laziness on part of insulation contractors is the reason why baffles or ridge vents are not placed at all the bird vents above the house.
But why are they even needed in the first place? The reason is two-fold.
1. Baffles direct airlflow up the roof slope and out the ridge vents if you have them. If you don't have baffles then the air that vents the attic will blow back the insulation a good foot or more from the sides of the house.
2. Some contractors will put a fiberglass batt in-place of a baffle because the fiberglass batt is rigid and won't blow back. The fiberglass batt insulation will allow airlflow to pass through it (as all loose fill insulation will) but there is a problem with this scenario. The fiberglass batt insulation allows hot outside air to pass through it but it does not direct the airflow up and away from the drywall ceiling. So while the outside air is passing through the batt, it is also heating the drywall which defeats the purpose of the fiberglass batt.
Baffles can be cardboard, plastic or Styrofoam material and come in 16" on center or 24" on center sizes. Expect to pay a little more for baffles especially in a retrofit situation and garages are NOT included in the square footage of your attic or in insulation quotes.
Converting a garage into livable space takes some planning but is well worth the effort. A carefully planned mancave doesn't have to break the bank either and can become a hangout haven for everyone.
Start with an idea
Have you been looking for a place to display a sports or hobby collection, or maybe you are just looking for a place you can call your own to unwind, or would you like a media and entertainment center to watch your favorite movies? Draw your layout of the room on graph paper. Typical garages are about 20' x 20', give or take. Plan where you will hang your cool collections, watch TV and sit and draw lighting, electrical, cable and plumbing plans around the design. You may find you run out of space and have to rework the design based on the layout of the garage.
We can't help you on the design, but here are the essentials you need to do to create a comfortable, functional and low cost man cave.
1. Insulate the walls
No, you don’t have to remove the drywall to insulate the walls, a simple drill and fill is all that is needed. A drill and fill method is easily done from the inside of the home where a two to three two inch holes per stud will be drilled and the wall cavity backfilled with cellulose insulation. Cellulose insulation has a higher R-value per inch then loose fill fiberglass. Because it is loose fill, it will fit around the electrical boxes, plumbing vents and electrical outlets. The holes are replaced with a foam plug by the insulation contractor. Garage door slots can be filled with 2" foam board reflective insulation and/or insulated and drywalled right over, taking away about 6" of space from the wall.
2. Insulate the ceilings
Here in Phoenix our attached garages are not insulated when our homes are built but if you are from back east or the Midwest most attached garages are insulated. Why? Well the temperature swings in cold climates are much more dramatic than here, even in the desert. In Chicago, for example they go from 0 degrees outside to 65 degrees inside, a change of 65 degrees. In Phoenix, we go from 110 degrees outside to 75 degrees inside, a change of only 35 degrees. That difference and also because sub-freezing temperatures are much more damaging than super hot temperatures, makes the difference when insulating attached garages in Phoenix. An R-38 or 12 inches of blown insulation is recommended for an attached garage.
3. Add ducting or a minisplit
You will need to take a look at your air conditioners size if you want to add more ducting to the garage for this upgrade. If your system is oversized, it will actually work to your benefit here where you can use the extra cooling capacity to help cool the garage. A rule of thumb is 1 ton of cooling capacity satisfies 400 sq ft. An energy efficient homes can stretch that ratio out to about 600 sq ft per ton. The location and size of the ductwork is also important and a function of your main home size, HVAC system size and airflow. Another alternative is to add a minisplit ductless AC system to cool the garage. These mini splits are great because they have no ductwork and potential for duct leakage. They can be framed into an external wall and can only be used when needed, helping to save energy.
4. Radiant barrier above the garage to keep the heat out
A radiant barrier will help keep the garage cool in the summer time and should be stapled along the roof truss not laid on top of the insulation. The reason is that once a radiant barrier gathers a layer of dust, it is totally ineffective. That is why radiant barrier chips or radiant barrier laid on the insulation do not work.
5. Electrical, cable and fiber lines
Plan where you will need electrical outlets, overhead lighting and light switches for electrical runs. Have an electrician check if your sub panel has enough space for the additional loads. Smurf tubes with a looped rope are convenient if you think you may need to add more cables like cable or power cords through the walls. Plan the location of your TV and if you will need an internet connection and their location. To minimize work, try to keep your major plumbing and electrical on the shared wall to the main house. Watch only movies or what can be accessed through the internet via a smart TV or a game console may not warrant the need for cable lines to be run.
If you plan on having a separate bathroom, wet bar or kitchen area, try keeping it close to your existing home. If your existing water lines run under the slab, a plumber will have to find a manifold behind the common wall and run new lines through the attic of even through the wall. If you have an existing laundry room or bathroom against that common wall, you can tap into the drain for new plumbing if you are planning on having a bathroom or kitchen sink.
You may need to relocate the attic hatch to a new storage closet along the wall of the main house to conceal the existing attic hatch if it's in the middle of the garage. Usually 5-6 feet of length is taken off of the garage area and sectioned off into a bathroom, bar area, storage closet with the attic hatch, and a media cabinet.
Since most garages are concrete slabs, you want to make sure it's not post-tension before hammering it up. If you plan on using your garage more as a work space, a coating of acrylic paint can transform the room by itself. If you plan on using the man cave more as living space, a sub floor base is essential just like the main part of the home.
Cool man cave ideas and links
Man Cave Club http://www.mancavesite.org/
Those are the essentials, next step is to decorate, get a 70" flat screen or movie projector and a comfort chair to kick back in. When done right, a man cave doesn't have to break the bank or drive your energy bills through the roof. For help with HVAC, duct design and insulation needs, contact Green ID to schedule your free assessment.
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