30C-012 approval letter bed rm 2012-14-12Jim and Ellen Boyle December 14, 2012
384 Florence Road
Florence, MA 01062
Subject Location: 384 Florence Road
Map Block: 30C - 012
Mr. and Ms. Boyle,
Your building permit application and plans dated 12-10-12 have been approved as drawn and per this memo. All work must meet applicable codes whether noted or not indicate within this
memo.
These items which will need to be accomplished as the project moves forward;
An interconnected smoke detector must be included within the new bedroom with a smoke/CO detector outside of the bedroom and in the immediate vicinity of the bedroom. (within 10’)
All permeable insulation must be enclosed within airtight cavities, sealed on six sides. This means knee walls must be enclosed on the back side and there must be an air barrier blocking
the joist cavities below the knee walls.
As of August 4th 2011 the 8th Edition MA code is the 2009 IRC with MA amendments.
In the following are some generic requirements which seem to be problematic.
This is not intended to be comprehensive, nor is it a substitute for purchasing and reading the MA codes. Read only international codes are available on line at http://publicecodes.cyberregs.com/icod
/ one must also consider the MA amendments to these codes which can be found at www.mass.gov/dps/bbrs .
The current relevant building codes are:
2009 IBC, 2009 IEBC, 2009 IMC, 2009 IRC, 2009 IECC, AA115, MA amendments.
Structures shall conform to 780 CMR 8th Edition 1 and 2 family building codes with MA amendments.
Grading plan for structures being constructed required. 780 CMR R401.3 for drainage requirements.
A basement drainage system is required in all basements 780 CMR R405.2.3. except those in group I soils (table R405.1)
Foundations that retain earth and enclose interior space require damp proofing 780 CMR R406.1.
Through wall form ties must be removed from both faces and patched with hydraulic cement. 780 CMR R406.2 of amendments.
Foundation anchor bolts must be ½” and be embedded a minimum of 7” into the concrete. 10” bolts! 780 CMR R403.1.6
Foundation walls require horizontal reinforcement 2 #4 bars one within 12” of the top and one in the middle if 8’ or less and 3 #4 bars at top and 3rds if over 8’. 780 CMR R404.1.2(1).
Also see vertical reinforcements requirements.
CMU foundations require 3/8” parging before damp proofing. 780 CMR R406.1 see exceptions.
Emergency escape is required out of every basement whether habitable or not. 780 CMR R310.1
Ceiling joist are intended to prevent spread, once raised above the wall plate they become rafters ties and may require up sizing of rafters and increased nailing for example with a
4” slope 8-16nd common are required at each connection. 780 CMR R802.3.1. When there is neither of these a structural ridge is required with a load path to the foundation.
Steel straps over the ridge or 1x4 minimum collar ties are required 4’ OC in the upper 1/3rd 780 CMR R802.3.1
Ridge boards must be the full depth of the cut. 780 CMR R802.3.
A complete window and header schedule is required. 780 CMR Table R502.5 for header sizing and number of jack studs required.
All framing materials which are not code prescriptive must have stamped engineering.
LVLs
I-joist and or Floor Truss
Roof truss
A braced wall plan identifying appropriate braced wall areas where required (R301.1) and braced wall method being used. 780 CMR 602.10.
Garage corners and large corner window/door layout may require special solutions.
All corners must be appropriately attached to the foundation.
When using PFH (R602.10.3.3) or PFG (R602.10.3.4) the nailing requirement is 4” and 3” respectively using 8d common nails or galvanized box nails.
When nailing sheathing make sure your pneumatic nailer’s pressure is properly set. Nails set too deep, essentially perforate the sheathing weakening it and contribute to building damage
in high wind events.
Ceiling heights minimum 7’ for habitable spaces, 6’8” for bathrooms includes tub/shower area if a shower head is used, 6’8” for basements, 6’4” at beams/ducts. 780 CMR R305.1. MA amended
Hazardous glazing locations, within 24” of a door, or within 60” of a stair, or across from hot tubs, spas, bathtubs within 60” if not 60” above the walking surface, and other locations.
780 CMR R308.4
Windows over 72” above grade with the opening less than 24” above the finished floor shall meet the 4” sphere rule. Order restrictors. 780 CMR R612.2
Egress and emergency escape requirements shall be strictly met.
Basements, habitable attics, and all sleeping rooms require emergency escape. 780 CMR R310
Windows within 44” of floor, DH 3.3 sqft min window size, Casement 20”x41” exception 5 sqft at 1st floor. Minimum clear opening 20”x24” or 24”x20”. 780 CMR R310.1.1
Two doors remote as possible at the normal level of travel, opening measured from the face of the slab to the stop with door at 90 degrees, one 32” and one 28” minimum 78” high. 780
CMR R311.2
Landing at each door 36” out and the width of the door minimum 36”, maximum step 7 ¾” from the top of the threshold and only in-swinging doors. 780 CMR R311.3
Stairs have critical standards, make sure you know the floor finishes when planning. Minimum tread 9”, maximum riser 8 ¼”, maximum overall variance for the run is 3/8”, 4” sphere rule
on risers except where the total rise is 30” or less 780 CMR R311.7.4.3 Exception, 4 3/8” on balustrade, 6” in the triangle. Graspable rail 1 ¼” minimum and 2” maximum rail, height
minimum 34” maximum 38”, required for 4 or more risers. Landing to landing constitutes a new run. Minimum 6’8” ceiling height from nosing. 780 CMR R311.7.
Guards 36” minimum height above walking surface, a bench is a walking surface, required for more than 30” above floor or grade within 36”, 4” sphere rule. 780 CMR R312.1.
Educate the plumber and electrician about maximum notch and hole sizes, and placement. 780 CMR R502.8 and R602.6. In bearing studs holes not larger than 40% of a stud no closer than
5/8 to the edge, In interior non-bearing studs holes not larger than 60% of a stud no closer than 5/8 to the edge, or holes in joist are a maximum 1/3 the depth not closer than 2” from
the top or bottom or to any other hole. Notches are different.
Drilling or notching of more than 50% of the wall plate width of an exterior wall or load bearing partition requires a 16 GA 1 ½” strap across the area and 6” beyond each side with 8
- 10nd nails. 780 CMR R602.6.1
Dryer duct transition is limited to 8’ of aluminum flex and must be exposed. 780 CMR M1502.4.3
Dryer duct maximum equivalent length is 25’ or per manufacturer’s specs. 780 CMR M1502.4.4.1, no screwed connections.
Markup air is required for any exhaust hood of 400 CFM or more. 780 CMR M1503.4
Fireplaces require all combustion air be provided from the exterior and below the firebox, duct work maintaining 1” clearance for 5’ from the duct outlet for all fireplaces
Fire and draft stopping shall be completed before rough inspection. 780 CMR R302.
Ignition barriers in place before final. 780 CMR R316.
Dwelling/Garage fire separation. An attached garage (within 3’ of main structure) is required to have ½” drywall on the garage side of the separation wall and if there is a finished
space above the garage all walls must have ½” drywall and the ceiling 5/8” drywall. 780 CMR R302.6
Energy aspects shall comply with the stretch energy code. 780 CMR Appendix 115AA or 2009 IECC.
An initial HERS evaluation is required including insulation levels anticipated.
A final HERS evaluation confirming code requirements have been met including duct testing.
A signed copy of the Thermal Bypass Checklist.
Energy information including mechanical equipment posted on the electric panel.
Remodeling and Additions can be completed in accordance with IECC 2009 with Energy Star Windows and the Thermal Bypass Checklist. Duct blast testing when practicable.
All band joist insulation must be enclosed within an air tight cavity, which you must create.
Vapor retarders. Although these are still in the code have exceptions, one must understand that there is a difference between a vapor retarder or barrier and an air barrier. An air barrier
is intended to stop air flow (convection) a vapor retarder or barrier is intended to stop molecular moisture transfer (diffusion). A vapor retarder or barrier is effective even if there
are some holes or gaps, however an air barrier has to be absolute and complete. If air can leak through an electrical device or through a crack it follows the path of least resistance
and carries 99% of the moisture in a structure. This is evident every time one exposes fiberglass insulation and finds black insulation, which is dirt filter out of the air moving through
the insulation. 780 CMR R601.2 for vapor retarders and Table N1102.4.2 for air sealing requirements.
Unvented attic assemblies. Hot roofs are allowed, but have specific requirements 780 CMR R806.4.
Deck ledgers and post must be appropriately attached, bolts or lags. 780 CMR R502.2.2.1 Note: ThruLoks are engineered for post attachment supporting a railing.
Smoke and CO detectors as required. 780 CMR R314 and R315.
Smokes in each bedroom, within 10’ of a bedroom door.
CO within 10’ of bedroom doors, at each level, at the bottom of a stair leading to a finished floor above, for every 1500 sqft, (plumbing code in the mechanical room) Except if there
are no fossil burning fuels.
Heat detector in attached garage, and other large unfinished unconditioned spaces.
Closets beneath stair which have doors must be drywalled with ½”. 780 CMR R302.7
If there is mechanical equipment or a combustible roof, 30 sqft of space, and 30” measured from top of ceiling joist to bottom of rafters an attic access of minimum RO of 22” x 30” is
required to be located in an accessible place. It must be insulated, gasketed, and secured in place.
Feel free to call if you have any questions. My telephone number is 587-1240 and office hours are Monday through Friday, 8:30 am to 4:30 pm, excepting we close for walk-ins at 12:00
noon on Wednesdays. My email address is: cmiller@northamptonma.gov
Thank you for your cooperation on these matters.
Chuck Miller
City of Northampton
Assistant Commissioner and Zoning Enforcement