HOW TO INSULATE A WOODSHED ROOFLINE

QUESTION FROM :  lynn from Jackson, MI

 We had a wood shed built that we are useing as a woodshop.  It has open rafters.  We have sofits, shingled roof with a ridge vent. 

My question is how we should insulate the celing.  We will be heating the shed when we use it.  Not a continual heat.  We were just going to put fiberglass rolled insulation with paper back up there. 

We would appreicate your expertise on this.  Thank you. 

I will watch for your email and have a nice day.

ANSWER TO INSULATION DOCTOR QUESTION:
There is no ceiling . Open all the way up to the rafters and roof decking.  Thank you




ANSWER FROM THE INSULATION DOCTOR:

Does you shed have a ceiling other than the roof line of the shed? As soon as I receive your answer I can give you some answers to your questions.

FINAL ANSWER:

Hello Lynn,

It is not recommended that you insulate the under side of a roof because the lack of ventilation would rot your roof.

However, if you decide to insulate the wood shed it is imperative that you leave at least 1-1/2" space between the underside of the roof deck and the top of the insulation. Be aware that insulation is guaranteed to be a minimum thickness and quite often expands beyond that minimum.

I would recommend that if you do insulate the roof line you install a baffle or a Proper Vent (trade name) from top to bottom before installing the insulation. In other words, you will have Proper Vents covering all the underside of the plywood creating an airspace.

You will also need to install a ridge vent on the roof and soffit vent in your overhang if you should decide to insulate your wood shed.

The Federal Code requires that insulation be covered with a non-combustible material such as drywall.

Hope this helps.

Bruce Jones
The Insulation Doctor