The attached picture is an example of the nail spacing for a roof deck connection. The spacing on this truss is about every 6 inches. If the roof that was attached using 8D nails with a minimum plywood thickness of 7/16 inch, this would fall under letter C for roof deck attachments on the wind mitigation form.
The picture that I studied was showing the difference between platform and balloon frame houses. The balloon frame has continue with studs running from the ground floor to the attic. The platform frame has studs running from floor to ceiling and then the floor above it is built over the previous with new studs for each floor.
This is an image of a garage door located in my home. There is extra horizontal bracing going along the length of the door on all panels. The door track is secured to the wall by seven track mounting brackets. The glass windows at the top of the door are not impact rated windows.
For this assignment I looked at an article about Wind Mitigation. Wind Mitigation is a process of constructing a house to limit the amount of damage that can be caused by high or extreme winds. These can include implementing this like the geometry of the roof line and installation of the roof deck and trusses with proper nails and hardware. By having a home that is properly mitigated a homeowner can see credits applied to there house insurance for less expensive insurance. This can happen because the insurance companies now look at that home with a lesser risk value.
I did my research assignment on something we take for granted, The pull down attic stair wells. These stairs are often installed by a non licensed DIY homeowner and not installed properly. When using these stairs take a second and actually inspect the installation to ensure your safety before using them to enter the attic. Any defects should be reported.
wind mitigation inspections are techniques in order to limit damage from intense winds home owners premiums covering wind damage can be up to 70% of the total wind mitigation benefits the owner from reduced premiums wind mitigation protect the home even if the home is insured in florida lenders require homes to carry wind mitigation in order to be approved for a mortgage. doors windows garage doors roof are all part of a wind mitigation inspection.
in the pictures shown is of a garage door that does not meet the florida code for (wind) hurricanes. there are windows present witch are not impact rated nor comply with code for (wind) hurricane resistance. Not the correct amount of struts (3) on this door) for hurricane impact, also not the correct number of rollers and hinges for wind code compliance (hurricane proof)
When inspecting the garage door, check to see if it passes the wind load and impact testing. Look for steel door panels and check for windows or openings. There should be 6 to 9 track mounting brackets, and horizontal reinforcements. Some may have vertical reinforcements systems.
There are three types of underlayment used beneath roofing. Asphalt-saturated felt, rubberized asphalt and non-bitumen synthetic. Most common used in residential is black asphalt-saturated felt paper. Felt underlayment is water-resistant, but not waterproof. You can add a secondary water resistance (SWR) material by either taping sheeting seams with a self adhering modified bitumen strips or full deck coverage. This will add a secondary means to protect the dwelling from water intrusion.
This is an image of a glazed opening with horizontal tracks on the top and bottom. The tracks give ample room outside of the openings dimensions for the shutters to fully protect the opening. This House was fully protected with shutters.
Learning deeper about roof deck attachments and roof to wall attachments was beneficial to me and will help me perform more accurate wind mitigation inspections in south Florida. Particularly being able to understand further the difference between and 8d and a 6d nail
This is an example of a Roof to Wall Attachment. This would qualify as B. Clips as, metal connectors that do not wrap over the top of the truss or rater. There are more than 3 required nails in this strap.
I chose the wind mitigation article. I was surprised to learn that a Hip Roof is the most desirable roof for wind mitigation. I was unaware that “hip roofs receive up to 40% less pressure from wind than gable roofs.” I was also surprised to learn that a “hip roof” is only classified as a Hip Roof is less than 10% of the perimeter is non-hip.
This picture is of an aluminum garage door that has added horizontal bracing. However, the track mounting brackets were not sufficient nor were there any labels to indicate high wind testing or certification. Therefore, this door would not qualify for any credits toward insurance premiums.
Wind mitigation is the implementation of certain building techniques in order to limit damage caused by intense wind. A few of the critical areas include: the roof covering and attachment, secondary water protection, the roof to exterior wall attachment, garage door, and window design materials and coverings.
This photo shows a close up of a roof hurricane clip connecting the roofing rafter to the wall and top plate. A Clip should be on each rafter connection to secure the roof truss or rafter to the wall envelope.
The image on balloon framing shows that the wall studs are continuous all the way up to the roof rafters. This type of framing was common years ago, but poses a caution when it comes to fires being able to travel through the wall cavities quicker.
This image was taken from the attic that I inspected for a wind mitigation. The roof deck material is made of plywood with a 1/2 inch thickness. The space between each nails of the roof deck attachment to the truss was 5 inches. I didn’t notice any missed nails and the roof deck was sound to the trusses.
My research assignment is based on the article “Inspecting Roof Panel Sheathing”. This article explained to me the difference between the different types of roof deck attachments and how they should be installed. It is important that during an inspection that you look for the correct type of fastener such as 8d nails and to make sure that they are spaced apart accordingly.
what an amazing post admin thanks for this.
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