Why secure a loft trapdoor in a storm? And what's the roof pitch to do with anything?

"Close and secure loft trapdoors with bolts, particularly if roof pitch is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

On 07/01/2020 20:01, Commander Kinsey wrote:
Why secure a loft trapdoor in a storm?* And what's the roof pitch to do
with anything?

"Close and secure loft trapdoors with bolts, particularly if roof pitch
is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm


Bernouilli.

I don't know their reasons, but mine used to come open during high winds
dumping tons of old muck and dust onto my landing. Its now held shut with
duct tape. No nasty whining noises or rattles either. The roof on this
property is open ie it can bee seen there are gaps under the tiles, so one
assumes if that hole was through to the house and a really spectacular wind
came it could blow many tiles off the roof.
Brian

--
----- --
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...
Why secure a loft trapdoor in a storm? And what's the roof pitch to do with
anything?

"Close and secure loft trapdoors with bolts, particularly if roof pitch is
less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

On Tue, 7 Jan 2020 20:13:13 -0000, Brainless & Daft (Sofa), the notorious,
troll-feeding senile idiot, blathered again:

I don't know their reasons,

Righto, but you'll feed the sociopathic attention whore anyway, right,
Brainless & Daft?

Ah, you mean one of those strange ones that opens downwards? Mine lifts up, a much more sensible arrangement. It simply cannot open itself, it's too heavy.

On Tue, 07 Jan 2020 20:13:13 -0000, Brian Gaff (Sofa) wrote:

I don't know their reasons, but mine used to come open during high winds
dumping tons of old muck and dust onto my landing. Its now held shut with
duct tape. No nasty whining noises or rattles either. The roof on this
property is open ie it can bee seen there are gaps under the tiles, so one
assumes if that hole was through to the house and a really spectacular wind
came it could blow many tiles off the roof.
Brian

On Tue, 07 Jan 2020 20:01:24 -0000, Birdbrain Macaw (aka "Commander Kinsey",
"James Wilkinson", "Steven ******","Bruce Farquar", "Fred Johnson, etc.),
the pathological resident idiot and attention whore of all the uk ngs,
blathered again:

FLUSH the abnormal sociopathic attention whore's latest attention-baiting
sick bull**** unread again

--
about Birdbrain Macaw's (now "James Wilkinson" LOL)
trolling:
"He is a well known attention seeking troll and every reply you
make feeds him.
Starts many threads most of which die quick as on the UK groups anyone
with sense Kill filed him ages ago which is why he now cross posts to
the US groups for a new audience.
This thread was unusual in that it derived and continued without him
to a large extent and his silly questioning is an attempt to get
noticed again."
MID:

--
ItsJoanNotJoann addressing Birdbrain Macaw's (now "James Wilkinson" LOL):
"You're an annoying troll and I'm done with you and your
stupidity."
MID:

--
AndyW addressing Birdbrain:
"Troll or idiot?...
You have been presented with a viewpoint with information, reasoning,
historical cases, citations and references to back it up and wilfully
ignore all going back to your idea which has no supporting information."
MID:

--
Phil Lee adressing Birdbrain Macaw:
"You are too stupid to be wasting oxygen."
MID:

--
Phil Lee describing Birdbrain Macaw:
"I've never seen such misplaced pride in being a ****ing moronic motorist."
MID:

--
Tony944 addressing Birdbrain Macaw:
"I seen and heard many people but you are on top of list being first class
ass hole jerk. ...You fit under unconditional Idiot and should be put in
mental institution.
MID:

--
Pelican to Birdbrain Macaw:
"Ok. I'm persuaded . You are an idiot."
MID:

--
DerbyDad03 addressing Birdbrain Macaw (now "James Wilkinson" LOL):
"Frigging Idiot. Get the hell out of my thread."
MID:

--
Kerr Mudd-John about Birdbrain Macaw (now "James Wilkinson" LOL):
"It's like arguing with a demented frog."
MID:

--
Mr Pounder Esquire about Birdbrain Macaw (now "James Wilkinson" LOL):
"the **** poor delivery boy with no hot running water, 11 cats and
several parrots living in his hovel."
MID:

--
Rob Morley about Birdbrain:
"He's a perennial idiot"
MID: 20170519215057.56a1f1d4@Mars

--
JoeyDee to Birdbrain
"I apologize for thinking you were a jerk. You're just someone with an IQ
lower than your age, and I accept that as a reason for your comments."
MID: l-september.org

--
Sam Plusnet about Birdbrain (now "James Wilkinson Sword" LOL):
"He's just desperate to be noticed. Any attention will do, no matter how
negative it may be."
MID:

--
asking Birdbrain:
"What, were you dropped on your head as a child?"
MID:

--
Christie addressing endlessly driveling Birdbrain Macaw (now "James
Wilkinson" LOL):
"What are you resurrecting that old post of mine for? It's from last
month some time. You're like a dog who's just dug up an old bone they
hid in the garden until they were ready to have another go at it."
MID:

--
Mr Pounder's fitting description of Birdbrain Macaw:
"You are a well known fool, a tosser, a pillock, a stupid unemployable
sponging failure who will always live alone and will die alone. You will not
be missed."
MID:

--
Richard to pathetic ****** Hucker:
"You haven't bred?
Only useful thing you've done in your pathetic existence."
MID:

--
about Birdbrain (now "James Wilkinson" LOL):
""not the sharpest knife in the drawer"'s parents sure made a serious
mistake having him born alive -- A total waste of oxygen, food, space,
and bandwidth."
MID:

--
Mr Pounder exposing sociopathic Birdbrain:
"You will always be a lonely sociopath living in a ******** with no hot
running water with loads of stinking cats and a few parrots."
MID:

--
francis about Birdbrain (now "James Wilkinson" LOL):
"He seems to have a reputation as someone of limited intelligence"
MID:

--
Peter Moylan about Birdbrain (now "James Wilkinson" LOL):
"If people like JWS didn't exist, we would have to find some other way to
explain the concept of "invincible ignorance"."
MID:

--
Lewis about nym-shifting Birdbrain:
"Typical narcissist troll, thinks his **** is so grand he has the right to
try to force it on everyone."
MID:

"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

"Close and secure loft trapdoors with bolts, particularly if roof pitch is
less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

On Wed, 8 Jan 2020 07:35:23 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:


In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

In practice BOTH of you are clinically insane trolling idiots!

--
Marland answering senile Rodent's statement, "I don't leak":
"That¢s because so much **** and ****e emanates from your gob that there is
nothing left to exit normally, your arsehole has clammed shut through disuse
and the end of prick is only clear because you are such a ******."
Message-ID:

On Tue, 07 Jan 2020 20:35:23 -0000, Rod Speed wrote:



"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

I wonder what the roof pitch has to do with it.

"Close and secure loft trapdoors with bolts, particularly if roof pitch is
less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

Commander Kinsey wrote
Rod Speed wrote
Commander Kinsey wrote

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

I wonder what the roof pitch has to do with it.

That's what determines whether you get the aerofoil effect.

When the pitch is too high, you don't.

"Close and secure loft trapdoors with bolts, particularly if roof pitch
is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

On Wed, 8 Jan 2020 08:55:04 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the two clinically insane sociopaths' endless troll****

--
Another typical retarded conversation between our two village idiots,
Birdbrain and Rodent Speed:

Birdbrain: "You beat me to it. Plain sex is boring."

Senile Rodent: "Then **** the cats. That wont be boring."

Birdbrain: "Sell me a de-clawing tool first."

Senile Rodent: "Wont help with the teeth."

Birdbrain: "They've never gone for me with their mouths."

Rodent Speed: "They will if you are stupid enough to try ****ing them."

Birdbrain: "No, they always use claws."

Rodent Speed: "They wont if you try ****ing them. Try it and see."

Message-ID:

On Tue, 07 Jan 2020 21:55:04 -0000, Rod Speed wrote:

Commander Kinsey wrote
Rod Speed wrote
Commander Kinsey wrote

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

I wonder what the roof pitch has to do with it.

That's what determines whether you get the aerofoil effect.

When the pitch is too high, you don't.

But how can that get to the loft hatch?

"Close and secure loft trapdoors with bolts, particularly if roof pitch
is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

"Commander Kinsey" wrote in message
newsp.0d1n3vgmwdg98l@glass...
On Tue, 07 Jan 2020 21:55:04 -0000, Rod Speed
wrote:

Commander Kinsey wrote
Rod Speed wrote
Commander Kinsey wrote

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

I wonder what the roof pitch has to do with it.

That's what determines whether you get the aerofoil effect.

When the pitch is too high, you don't.

But how can that get to the loft hatch?

The suction effect in the roof space sees air moved
out of the house into the roof space, lifting the hatch.

"Close and secure loft trapdoors with bolts, particularly if roof
pitch
is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

On Tue, 07 Jan 2020 21:55:04 -0000, Rod Speed wrote:

Commander Kinsey wrote
Rod Speed wrote
Commander Kinsey wrote

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

I wonder what the roof pitch has to do with it.

That's what determines whether you get the aerofoil effect.

When the pitch is too high, you don't.

Who has a loft in a roof under 30 degrees? That wouldn't be possible.

"Close and secure loft trapdoors with bolts, particularly if roof pitch
is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

"Commander Kinsey" wrote in message
newsp.0d1n42n5wdg98l@glass...
On Tue, 07 Jan 2020 21:55:04 -0000, Rod Speed
wrote:

Commander Kinsey wrote
Rod Speed wrote
Commander Kinsey wrote

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

I wonder what the roof pitch has to do with it.

That's what determines whether you get the aerofoil effect.

When the pitch is too high, you don't.

Who has a loft in a roof under 30 degrees?

You do so a few mansard roofs like that.

That wouldn't be possible.

Corse it is with a mansard roof.

"Close and secure loft trapdoors with bolts, particularly if roof
pitch
is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

On Tue, 07 Jan 2020 20:35:23 -0000, Rod Speed wrote:



"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

The conservatory I've half built is staying firmly put. I guess I bolted it together well :-)

"Close and secure loft trapdoors with bolts, particularly if roof pitch is
less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

"Commander Kinsey" wrote in message
newsp.0d1jwqxqwdg98l@glass...
On Tue, 07 Jan 2020 20:35:23 -0000, Rod Speed
wrote:



"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

The conservatory I've half built is staying firmly put. I guess I bolted
it together well :-)

You can get flatish roofs lifted right off by strong
winds. basically due to the aerofoil effects.

"Close and secure loft trapdoors with bolts, particularly if roof pitch
is
less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

On Wed, 8 Jan 2020 08:57:36 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the two sociopathic prize idiots' endless troll****

--
Another typical retarded "conversation" between the two resident idiots:

Birdbrain: "But imagine how cool it was to own slaves."

Senile Rodent: "Yeah, right. Feed them, clothe them, and fix them when
they're broken.
After all, you paid good money for them. Then you've got to keep an eye
on them all the time."

Birdbrain: "Better than having to give them wages on top of that."

Senile Rodent: "Specially when they make more slaves for you
and produce their own food and clothes."

MID:

On Tue, 07 Jan 2020 21:57:36 -0000, Rod Speed wrote:



"Commander Kinsey" wrote in message
newsp.0d1jwqxqwdg98l@glass...
On Tue, 07 Jan 2020 20:35:23 -0000, Rod Speed
wrote:



"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

The conservatory I've half built is staying firmly put. I guess I bolted
it together well :-)

You can get flatish roofs lifted right off by strong
winds. basically due to the aerofoil effects.

Not done the roof yet. Hmmm, perhaps I should secure it very tightly. Mind you polycarbonate can snap easily in a wind. How powerful is aerofoil in a wind? The limit would be 14psi, which would be horrendous, but I assume that needs a lot of wind.

"Close and secure loft trapdoors with bolts, particularly if roof pitch
is
less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

"Commander Kinsey" wrote in message
newsp.0d1n2gjawdg98l@glass...
On Tue, 07 Jan 2020 21:57:36 -0000, Rod Speed
wrote:



"Commander Kinsey" wrote in message
newsp.0d1jwqxqwdg98l@glass...
On Tue, 07 Jan 2020 20:35:23 -0000, Rod Speed
wrote:



"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

The conservatory I've half built is staying firmly put. I guess I
bolted
it together well :-)

You can get flatish roofs lifted right off by strong
winds. basically due to the aerofoil effects.

Not done the roof yet. Hmmm, perhaps I should secure it very tightly.
Mind you polycarbonate can snap easily in a wind.

How powerful is aerofoil in a wind?

Flat roofs regularly get ripped right off and land on the
neighbour's etc. Corse that's in cyclones and hurricanes.

The limit would be 14psi, which would be horrendous, but I assume that
needs a lot of wind.

Yeah, normally only in cyclones and hurricanes etc.

"Close and secure loft trapdoors with bolts, particularly if roof
pitch is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm

On 07/01/2020 20:35, Rod Speed wrote:


"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

"Close and secure loft trapdoors with bolts, particularly if roof
pitch is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm


I agree. A low pressure from the outside will pull on a roof's attic
space to try to equalise with the internal pressure of the attic/home.

If the roof opens a pathway is created. If the attic door opens,
another pathway is created. This very small pathway then becomes subject
to the mass of air in the home. This mass compresses and speeds up as it
passes through the smaller hole and can be a very strong rush of air.

On Fri, 10 Jan 2020 06:24:53 -0000, RayL12 wrote:

On 07/01/2020 20:35, Rod Speed wrote:


"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

"Close and secure loft trapdoors with bolts, particularly if roof
pitch is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm


I agree. A low pressure from the outside will pull on a roof's attic
space to try to equalise with the internal pressure of the attic/home.

If the roof opens a pathway is created. If the attic door opens,
another pathway is created. This very small pathway then becomes subject
to the mass of air in the home. This mass compresses and speeds up as it
passes through the smaller hole and can be a very strong rush of air.

For all that to happen, you have to lose part of your roof. This is unlikely, and if it did happen, an opening loft hatch would be the least of your worries. If the roof doesn't fail, the pressure of air in the loft and the house both remain at 14psi, so no hatch moving.

"Commander Kinsey" wrote in message
newsp.0d7j8jwgwdg98l@glass...
On Fri, 10 Jan 2020 06:24:53 -0000, RayL12 wrote:

On 07/01/2020 20:35, Rod Speed wrote:


"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

"Close and secure loft trapdoors with bolts, particularly if roof
pitch is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm


I agree. A low pressure from the outside will pull on a roof's attic
space to try to equalise with the internal pressure of the attic/home.

If the roof opens a pathway is created. If the attic door opens,
another pathway is created. This very small pathway then becomes subject
to the mass of air in the home. This mass compresses and speeds up as it
passes through the smaller hole and can be a very strong rush of air.

For all that to happen, you have to lose part of your roof.

Nope, tiled roofs arent airtight.

This is unlikely,

Plenty of tiles come off in strong winds.

and if it did happen, an opening loft hatch would be the least of your
worries.

Wrong again when the open hatch makes
it more likely that tiles will come off.

If the roof doesn't fail, the pressure of air in the loft and
? the house both remain at 14psi, so no hatch moving.

Tiled roofs arent airtight.

On Sat, 11 Jan 2020 17:12:12 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the two clinically insane assholes' latest troll**** unread again

--
Another typical retarded conversation between our two village idiots,
Birdbrain and Rodent Speed:

Birdbrain: "You beat me to it. Plain sex is boring."

Senile Rodent: "Then **** the cats. That wont be boring."

Birdbrain: "Sell me a de-clawing tool first."

Senile Rodent: "Wont help with the teeth."

Birdbrain: "They've never gone for me with their mouths."

Rodent Speed: "They will if you are stupid enough to try ****ing them."

Birdbrain: "No, they always use claws."

Rodent Speed: "They wont if you try ****ing them. Try it and see."

Message-ID:

On 11/01/2020 3:06, Commander Kinsey wrote:
On Fri, 10 Jan 2020 06:24:53 -0000, RayL12 wrote:

On 07/01/2020 20:35, Rod Speed wrote:


"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

"Close and secure loft trapdoors with bolts, particularly if roof
pitch is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm



I agree. A low pressure from the outside will pull on a roof's attic
space to try to equalise with the internal pressure of the attic/home.

If the roof opens a pathway is created. If the attic door opens,
another pathway is created. This very small pathway then becomes subject
to the mass of air in the home. This mass compresses and speeds up as it
passes through the smaller hole and can be a very strong rush of air.

For all that to happen, you have to lose part of your roof. This is
unlikely, and if it did happen, an opening loft hatch would be the least
of your worries. If the roof doesn't fail, the pressure of air in the
loft and the house both remain at 14psi, so no hatch moving.

Correct, it's all about 2 pressures wanting to equalise. Whether you
lose your roof and even your loft door depends on the pressure
difference and the speed it presents itself and, the time it exists. If
your roof and ceilings structure cannot allow the equalisation to
happen, the forces that keep them to your building can be overcome.

On Mon, 13 Jan 2020 16:38:17 +0000, RayL12, another brain dead,
troll-feeding, senile idiot, blathered again:


Correct, it's all about 2 pressures wanting to equalise.

Nope, senile idiot, it's all about him setting out baits for senile assholes
like you and you taking them every time! It's NOTHING else!

On Mon, 13 Jan 2020 16:38:17 -0000, RayL12 wrote:

On 11/01/2020 3:06, Commander Kinsey wrote:
On Fri, 10 Jan 2020 06:24:53 -0000, RayL12 wrote:

On 07/01/2020 20:35, Rod Speed wrote:


"Commander Kinsey" wrote in message
newsp.0d1gkmz9wdg98l@glass...

Why secure a loft trapdoor in a storm?

And what's the roof pitch to do with anything?

In theory you can get a suction effect similar to
what you get with an aircraft aerofoil section.

In practice it isnt seen often enough to matter.

"Close and secure loft trapdoors with bolts, particularly if roof
pitch is less than 30°"

https://www.metoffice.gov.uk/weather...afe-in-a-storm



I agree. A low pressure from the outside will pull on a roof's attic
space to try to equalise with the internal pressure of the attic/home.

If the roof opens a pathway is created. If the attic door opens,
another pathway is created. This very small pathway then becomes subject
to the mass of air in the home. This mass compresses and speeds up as it
passes through the smaller hole and can be a very strong rush of air..

For all that to happen, you have to lose part of your roof. This is
unlikely, and if it did happen, an opening loft hatch would be the least
of your worries. If the roof doesn't fail, the pressure of air in the
loft and the house both remain at 14psi, so no hatch moving.

Correct, it's all about 2 pressures wanting to equalise. Whether you
lose your roof and even your loft door depends on the pressure
difference and the speed it presents itself and, the time it exists. If
your roof and ceilings structure cannot allow the equalisation to
happen, the forces that keep them to your building can be overcome.

My point is.... assuming your roof is still on firmly, there is very little pressure difference between your house and your attic. So no reason for the trapdoor to move.