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Re: electronic stud finder to detect roof joists?

Wow is this getting off topic - but interesting.

Typical new roof constructions here in the Carribean is 3x12 rafters covered
with a 1 inch cedar sub (inside roof).  On top of this goes 2" styrofoam
insulation (for noise and heat) between runners.  Generally corrigated metal
roofing is attached on top with stainless screw fasteners.  Hurricane clips
are installed at each joist point.  Lowest temperature we've seen in 15
years is 65F.  Highest 95F.  Our roofs have survived 160 mph winds.

You can attach a tripod tower anywhere.  I don't - I have a crank up tower
beside the house.

Mal, NP2L

----- Original Message -----
From: Murray Peterson VK2KGM <vk2kgm@ihug.com.au>
To: Estes Wayne-W10191 <W10191@motorola.com>
Cc: AMSAT-BB <amsat-bb@AMSAT.Org>
Sent: Wednesday, January 24, 2001 9:39 PM
Subject: Re: [amsat-bb] electronic stud finder to detect roof joists?

> Hi Wayne,
>     Yes, that is a bit different to they way houses are built in
> My house, for instance has a zinc-aluminium coated, profiled steel sheets
> the outer clading which is screwed to wooden battons which are attached
> horizontally across wooden joists. These joists extend from the ridge of
> roof to beyond the outer walls of the house (about 18 inches) to form the
> eves. There are boards on top of the joists where they are over the eves
> prevent birds and bugs etc. entering the ceiling space. The roof cladding
> ends above the gutters which are mounted on the ends of the joists. You
> easily see where the ends of the joists are and so locating them is easy
> me. I have eye bolts anchored in some of the joists in the house roof
> the guys for my 100 foot tower attach to. They are sealed using a silicon
> rubber sealant where the eyebolts pass through the cladding.
>     The most popular roof clading in Sydney is terra cotta (ceramic)
> The second most popular cladding is the many varieties of metal cladding
> the other significant roof clading material is slate. Probably has
> to do with climate and durability. Sydney's lowest temperature on record
> (last 160 year or so) is 33 farinheight (1 Celcius) and highest is 117F.
> only ice we see is from hail storms. Maximum wind speed is 47m/s ( 105
> Regards,
> Murray Peterson
> > Wayne replies:
> >
> > I may do something like you described, but I can't see the nails going
> into the joists when the first shingles are applied because the nails are
> obscured by the felt layer.  I have thought about marking the joist
> locations on fascia boards before the felt is applied.  The fascia
> would be visible after the new shingles are applied.  To do this, I would
> have to be there when the roofing company rips off the old felt.
> >
> > By the way, the roofing shingles in the U.S. are typically asphalt
> composition, not plywood.  From bottom to top, the typical roof layers are
> joist, plywood, felt, and then shingles.  Most houses in the U.S. use
> asphalt composition shingles.  Some upscale houses have wooden shingles
> which are somewhat of a fire hazard even when treated with fire-retardant
> chemicals.  Tile roofs are rare in my part of the country, but common in
> regions that get much less frozen precipitation.
> >
> > Wayne Estes W9AE
> > Mundelein, IL, USA
> >
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