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#32
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On Mon, 29 Oct 2012 05:01:08 -0400, JustWait wrote:
On 10/28/2012 11:32 PM, Tim wrote: On Oct 28, 9:37 pm, JustWait wrote: On 10/28/2012 10:30 PM, JustWait wrote: On 10/28/2012 10:27 PM, bob wrote: On Sat, 27 Oct 2012 15:10:58 -0700 (PDT), Tim wrote: On Oct 27, 5:07 pm, bob wrote: yeah it's headed our way. i'm about 70 miles inland from the jersey shore. boat's out for the winter but it's on blocks so we'll see what happens. hope everyone does well! Hope you can ride it out fine, Bob. And hope the Tolly makes it OK too! thanks tim...will find out wednesday! glub glub Left or right of the eye?? We are in a particularly bad area I think.. As the thing goes west the top edge will be slaughtering us with full force winds, and as it wraps around us and turns to the north and out again, we will be on the right side of the storm for what they feel may be a full 36 hours of full force hurricane rain AND wind... This is gonna' **** us up bad. Maybe not, Scott. Hope not at least, but at least you have your generator handy. Now would be a good time to do a test fire before anything hits. Yup, took it out and ran it for a while yesterday... Me too. That Generac is a noisy little ****. But, it works. |
#33
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On 10/29/2012 11:00 AM, iBoaterer wrote:
Most wind damage is caused on the leeward side because if negative pressure. Note that this is NOT taking into account airborne debris. Prove it. |
#35
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#36
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#37
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On 10/29/2012 12:15 AM, Wayne B wrote:
On Sun, 28 Oct 2012 20:32:50 -0700 (PDT), Tim wrote: On Oct 28, 9:37 pm, JustWait wrote: On 10/28/2012 10:30 PM, JustWait wrote: On 10/28/2012 10:27 PM, bob wrote: On Sat, 27 Oct 2012 15:10:58 -0700 (PDT), Tim wrote: On Oct 27, 5:07 pm, bob wrote: yeah it's headed our way. i'm about 70 miles inland from the jersey shore. boat's out for the winter but it's on blocks so we'll see what happens. hope everyone does well! Hope you can ride it out fine, Bob. And hope the Tolly makes it OK too! thanks tim...will find out wednesday! glub glub Left or right of the eye?? We are in a particularly bad area I think.. As the thing goes west the top edge will be slaughtering us with full force winds, and as it wraps around us and turns to the north and out again, we will be on the right side of the storm for what they feel may be a full 36 hours of full force hurricane rain AND wind... This is gonna' **** us up bad. Maybe not, Scott. Hope not at least, but at least you have your generator handy. Now would be a good time to do a test fire before anything hits. ===== Yes, and also get some extra jerry jugs of fuel. If power goes out over a wide spread area, the gas stations can't pump even though they have it. After Hurricane Charlie in 2004 my neighbor and I were taking turns driving 30+ miles to find filling stations that were open. Be careful of carbon monoxide. There are always a few casualties after every big storm from people running the generator too close to the house (or in the garage). Although I still plan on losing power, it it starting to look to me like the storm is gonna stay south, and then a bit west of us enough that we will probably not get the 36 hour Hurricaine I was expecting yesterday. I guess 50+ Mph winds, with bands, as opposed to 90+ with steady rain... If you are interested, look at a map. I am just east and north of Hartford, on the map at the intersection of route 84 and 91. If you draw a cross on the state that puts us right about in the center of the cross, dead center of the state... |
#38
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In article ,
says... On Mon, 29 Oct 2012 13:06:16 -0400, iBoaterer wrote: In article , says... On Mon, 29 Oct 2012 11:00:08 -0400, iBoaterer wrote: Most wind damage is caused on the leeward side because if negative pressure. Note that this is NOT taking into account airborne debris. ... but it is the wind borne debris that causes the most damage ... or falling trees. The reason you put up shutters is to protect from the flying ****, not the wind. About half of the openings in my house now have impact rated windows and we are going to do the rest when we get around to renovating those areas. We are really only talking about 5 windows and they have shutters. The garage door is 150 MPH rated as is the front door and the french doors in the bedroom. All of the openings on the south and east side are current impact code. (9/16" laminated glass) I bet they would stop a small caliber handgun round. When they design for airborne debris there are parameters that are used as far as speed, size of debris, etc. But, wind can still be a bitch in and of itself, especially on the corners where a negative pressure is created. Negative pressures have the greatest effect on the roof. That is why we have a wind code here. Unfortunately they don't up north so I expect to see a lot of roof damage and even total failures. Most houses up there simply have the trusses toe nailed into the top plate, assuming all loads are down. There is absolutely zero uplift protection on the wall itself. You have 2 16d nails in the bottom of the stud and whatever you get from a few nails in celotex sheathing. Basically nothing. Even then, most roof failures get traced back to a failure of the building envelope and internal pressures blowing the roof off. That is why they are so serious about protecting doors and windows. The thing that will save them is that this is a weak cat 1 that will be a TS by the time the eye comes ashore. This will be a bad storm for them but don't confuse it with a hurricane. They call the wind speeds in a cat 2 hurricane a tornado when it hits up there and they have near total destruction in the path. Although I do not have the structural endorsement on my inspector's license, I have taken a lot of the structural courses. I could teach most of the electrical CEUs so I don't take them. I take other disciplines, particularly structural, because it is the most interesting. BTW that book you linked in the note above is good but over the head of most people and it is somewhat dated. Florida updated our wind zones last year. That book is still talking about the 2000 codes. http://gfretwell.com/electrical/2012...code%20map.jpg Corners, where the wind goes around and creates negative pressure is the first place that your siding will rip off. If you see a mobile home that was being towed up the interstate and the siding is coming off, it will be in the back corners. Yes, it is outdated, I didn't bother looking for IBC code books for a specific area or time. The rules have changed but the physics behind it has not. |
#39
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On Mon, 29 Oct 2012 13:30:04 -0400, JustWait wrote:
Although I still plan on losing power, it it starting to look to me like the storm is gonna stay south, and then a bit west of us enough that we will probably not get the 36 hour Hurricaine I was expecting yesterday. I guess 50+ Mph winds, with bands, as opposed to 90+ with steady rain... If you are interested, look at a map. I am just east and north of Hartford, on the map at the intersection of route 84 and 91. If you draw a cross on the state that puts us right about in the center of the cross, dead center of the state... The Jersey Shore is taking a bit of a battering, but my understanding is it is no longer a hurricane. The wind speeds are enough, but I'm hearing that it has been joined by that other low pressure system. At any rate, it's a very disorganized storm with no eye that I can see. I'm about 70 miles north of where it is to make landfall, and I'm surprised so far. The wind is shaking the trees, but so far I haven't seen many go down, and we have had much less rain than I was expecting. As it hasn't made landfall, this could all change, and I'm sure other places are getting whacked pretty good. |
#40
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In article ,
says... On Mon, 29 Oct 2012 13:46:38 -0400, iBoaterer wrote: In article , says... On Mon, 29 Oct 2012 13:06:16 -0400, iBoaterer wrote: In article , says... On Mon, 29 Oct 2012 11:00:08 -0400, iBoaterer wrote: Most wind damage is caused on the leeward side because if negative pressure. Note that this is NOT taking into account airborne debris. ... but it is the wind borne debris that causes the most damage ... or falling trees. The reason you put up shutters is to protect from the flying ****, not the wind. About half of the openings in my house now have impact rated windows and we are going to do the rest when we get around to renovating those areas. We are really only talking about 5 windows and they have shutters. The garage door is 150 MPH rated as is the front door and the french doors in the bedroom. All of the openings on the south and east side are current impact code. (9/16" laminated glass) I bet they would stop a small caliber handgun round. When they design for airborne debris there are parameters that are used as far as speed, size of debris, etc. But, wind can still be a bitch in and of itself, especially on the corners where a negative pressure is created. Negative pressures have the greatest effect on the roof. That is why we have a wind code here. Unfortunately they don't up north so I expect to see a lot of roof damage and even total failures. Most houses up there simply have the trusses toe nailed into the top plate, assuming all loads are down. There is absolutely zero uplift protection on the wall itself. You have 2 16d nails in the bottom of the stud and whatever you get from a few nails in celotex sheathing. Basically nothing. Even then, most roof failures get traced back to a failure of the building envelope and internal pressures blowing the roof off. That is why they are so serious about protecting doors and windows. The thing that will save them is that this is a weak cat 1 that will be a TS by the time the eye comes ashore. This will be a bad storm for them but don't confuse it with a hurricane. They call the wind speeds in a cat 2 hurricane a tornado when it hits up there and they have near total destruction in the path. Although I do not have the structural endorsement on my inspector's license, I have taken a lot of the structural courses. I could teach most of the electrical CEUs so I don't take them. I take other disciplines, particularly structural, because it is the most interesting. BTW that book you linked in the note above is good but over the head of most people and it is somewhat dated. Florida updated our wind zones last year. That book is still talking about the 2000 codes. http://gfretwell.com/electrical/2012...code%20map.jpg Corners, where the wind goes around and creates negative pressure is the first place that your siding will rip off. If you see a mobile home that was being towed up the interstate and the siding is coming off, it will be in the back corners. Yes, it is outdated, I didn't bother looking for IBC code books for a specific area or time. The rules have changed but the physics behind it has not. Losing your siding is not the issue, although we don't see a lot of it here because it is so easy to lose. The real issue is losing the roof, not just the shingles, the whole damned thing. You do get a significant uplift but when you lose a window on the windward side, it puts pressure in the house and adds tens of thousands of pounds of uplift to what is on top. Even a minimal cat 1 can put ~20,000 pounds in a 2000 sq/ft house. It sure can. Flat roofs for industrial buildings (1/4" per foot or less slope is considered flat) are a big problem as well, because usually there are penthouses and such that want to turn over and once that roof is breached, all hell breaks loose. But I digress, losing siding IS an issue and a big one. It isn't just that the siding is gone, but when, as you say with windows and doors, you have a positive pressure pushing the walls out, you also have a negative pressure on the leeward side. That is why great pains are taken anymore to make sure sheathing is nailed correctly. |
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