Good day all.

The shop I work in is looking to replace its roof (when it warms up).  Right now the roof is steel ribbed panels with fiberglass insulation underneath it.  The building is about 60 years old and the roof is almost 30 years old and has some leaking issues around the edges.  The support structure is iron main beams 20' apart with smaller cross beams every 4-5'.  Building is 50' x 100'.  I have suggested using sips when the roof is replaced to increase the insulation value and stop the issues of condensation and leaking due to ice dams.  It is a tapered roof and we are located in mid Michigan.  Is there a general number on cost per sqft?

What do you think.  I believe it is doable but does anyone have an experience with this type of retrofit?  Any installer recommendations?

Thanks for all your thoughts.

Regards,

Posted By gwiz on 07 Jan 2014 02:50 PM
Good day all.

The shop I work in is looking to replace its roof (when it warms up).  Right now the roof is steel ribbed panels with fiberglass insulation underneath it.  The building is about 60 years old and the roof is almost 30 years old and has some leaking issues around the edges.  The support structure is iron main beams 20' apart with smaller cross beams every 4-5'.  Building is 50' x 100'.  I have suggested using sips when the roof is replaced to increase the insulation value and stop the issues of condensation and leaking due to ice dams.  It is a tapered roof and we are located in mid Michigan.  Is there a general number on cost per sqft?

What do you think.  I believe it is doable but does anyone have an experience with this type of retrofit?  Any installer recommendations?

Thanks for all your thoughts.

Regards,

gwiz,
yes it is for new construction as well as retrofits over red-iron frame, panels are available in thicknesses 2" to 12" x 46" wide and upto 53 ft. long

The use of SIPs over steel buildings in retrofit application is very doable. The existing spacing of purlin beams allow you to specify a thinner panel. Your location is very near several major SIP manufacturers. I would suggest a 4-1/2" panel that can be delivered in 8' x 24' blanks or pre-fabricated with CNC equipment (to shorten your installation time). The cost should fall between $4.50 & $5.50 PSF. The industry has SIP fasteners that are self-taping and will allow direct attachment to a steel member. In your location with a climate zone of 5 or 6, an OSB roof panel is appropriate and less expensive. With an underlayment installed on top of the SIP, your ready to install a multi-crimp self-ventilating metal roof. An exposed fastener style roof will be your least expensive option and easiest to install. Lots of talented SIP installers in that area of the country. Al

Thanks for the quick responses. The price of $4.5-5.50 is that just the SIP or does it include more.

Depends on the provider. It would not include installation or delivery. It's possible to be in that range with accessories required for installation and fabrication included. good luck Al

We have a client interested in replacing their existing roof on a 6,000 SF building in San Francisco, CA. The existing structure has CMU walls that need to be tested to see if they have rebar, a concrete slab floor, steel trusses with a steel corrugated roof and no insulation below. The building was built at the turn of the century and is currently used as a automobile repair shop with car lifts, etc…The client would like to renovate the building for commercial office or art gallery use. We are interested interested in replacing the roof that will need to be insulated and have a descent look from below, as well as not add significantly to the weight or it will trigger a full seismic upgrade of the building. Can you please rlet us know what our options might be as well as cost? Thank You.