nigelforbes

Radiated heat means the heat contained in the heat store, eg your concrete roof tiles, is released over a long period in a directed stream. Convected heat means the air is heated which is then subject to the laws of air circulation. Yes, the radiant barrier will be very hot to the touch but because it is so thin it is unable to store heat, this means radiated heat that hits the barrier, stops it, the barrier then releases it immediately, into the air. The radiant barrier will be cool to the touch, 30 minutes after the radiated heat source is removed. Concrete tiles containing stored heat will continue to radiate heat for many hours after the sun goes down, easily until the small hours of the night. You have to decide which you want to deal with first, radiated heat or convected heat, ideally you will deal with both but unless you dampen the source of the heat (from the tiles first) you can't win. Again, blocking the source of radiated heat and then managing heated air, should be your priority sequence. There's a ton of information on this subject on the internet, strongly suggest you look through some of it. If it helps any, my roof was completely enclosed apart from small gable vents. I quadrupled the size of all four gable vents to where I have 3 square meters of out put air. I then replaced all the eves boards with slotted boards plus added other sources of cool air intake lower down. Next I added an exhaust fan behind one gable vent, that kicks in at 37 degrees and helps push air through. Lastly, I added almost a foot of rolled attic insulation on the attic floor. Today, my house is cold in the winter because I don't get any heat from the sun (the house is in the north). In the summer, even on the hottest days, we never use air con., only dehumidifiers.

Some good basic principles of attic ventilation here: https://snapzvent.com/post/the-why-and-how-of-proper-roof-ventilation/ Also, if you have a gable end(s) that helps, installing exit vents in them complements vented eaves boards.

If they are fresh air intakes, where is the exhaust? And once again, the amount of air in must equal the amount of air out, otherwise air flow is limited to the smaller of the two numbers. A roof contains many cubic metres/feet of hot air, small vents in the corner of the eaves means that it will take a very very long time to replace all the attic air once. Ideally, for heat control, the air should be replaced three times per hour,which means substantial venting in and out.

Well Hong Kong certainly is and it suffers badly with pollution from the Guangzhou industrial areas.

The thin metal film is a radiant barrier, designed to stop heat from the tiles radiating onto the attic floor. In essence, that barrier converts radiated heat to convected heat, or hot air, which also must be dealt with by venting. Sprayed on PU foam in your situation will only slow down the speed with which the roof tiles begin to create hot air in the attic. TBH, once you've got a radiant barrier installed, trying to install spray on foam is almost impossible. Ask me which is better, spray on foam or radiant barrier and radiant barrier wins every time. If me I would leave radiant barrier in place, forget PU foam and instal venting to manage the hot air. That might be vented or slotted eves boards which are easily retrofitted, or, vents in the ridge using bought in products to modify the ridge. Don't forget though, air out must equal air in or it doesn't work. Thai builders like to have slotted eves boards in the corner underside of the roof in the belief that the hot air will overflow outside. That only works if the vents are higher than the attic floor/roofs of the rooms below which will suffer from heat penetration unless they are insulated with rolls of insulation.

Exactly, the number of square centimetres of input air must be the same as the output, otherwise, output is limited to the smaller of the two numbers.

Train travel cards and buses passes are excellent value, use both, one third off train tickets, over 65 years free bus travel. Buy your rail card on line NOW. Lidl supermarkets really are cheaper, and it shows at the checkout. Wetherspoons pubs serve real ales inexpensively, often half price normal pubs. Don't smile at people, you'll get punched out. Do you have somewhere to stay? Money Savings Expert web site is a truly excellent site to help navigate high costs in the UK and point you towards sensible deals you might not otherwise be aware of. - Martin Lewis, a good bloke.

Soi 6, been to church then?

And don't forget the Taiwanese shake down debacle, news of that corrupt behaviour will stun tens of thousands of UK tourists into staying home in Morecambe and Clacton instead.

And wear a lucky ammulet.

Six years ago we tried to buy bus tickets using money and the driver looked at us as though we were mad. Others gathered round to join the sniggering and observe the strange behaviour, unbelievingly. "They must be tourists" one whispered to a friend, "from another dimension or time" another quipped. Later, we tried to buy train tickets on Euston station but there was no slot to accept the paper or the coins. At lunch in Covent Garden we paid by cash, "how quaint" the waiter said. Up in Lancaster I tried to pay for a pint and a half with a 50 Pound note, "we don't take 50's", the lad said. I offered a debit card and credit card but he refused, "we don't accept plastic", he said. "Look" I said in a huff, "I've tried to pay but you've refused everything I've offered, take it or leave it", I said. "We'll call the police if you don't pay", he said......and he did. I explained it all to the old bill who was sympathetic and offered to walk me to the ATM to get different cash, it was after 5:30pm and the shops were closed. We had a nice walk and a chat! Book your train tickets in advance using Trainline or similar, either that or take out a new bank loan each time.

True, although I was thinking more along the lines that the posters spends all his time in the bars everyday where he learns from people who know less than he does.

Herein lies a large part of the problem!

I have been here long enough to understand what you don't...yet. Indeed my experiences are different from many posters, why is that? I don't live in Pattaya, (or a bed sit in Burnely) I don't do the bars, I don't ride motorbikes, I studied economics and continue to do so, I don't repeat farang mantra's such as, "they manipulate the baht", "every cop is on the take", "if farangs left, the Thai economy would collapse", and so on. I don't like group think or herds.

It fits perfectly with their strategy of raising the price if it doesn't sell. You farang, you no understand.

I have copied your post and saved it for later when it comes back to haunt you, and haunt you it will, big time. :))

Yup, absolutely......I'm taking the names of the naysayers, right now. :))

The problem is worse currently because of the colder air and the inversion layer. As a general rule, if it's smoggy at ground level but you can still see blue sky through the clouded air, the problem is being exacerbated by the inversion layer which will typically burn off in the afternoon as the sun heats the air from above.

I forecast more forecasts.

I know of one general who gifted a house to a most senior politician of the day, the politic's. wife still comes by from time to time, a circa 55 mill. kinda deal.

Hahaha, I ran into the, "I'm a 747 pilot for Thai Airways" guy also, I asked him how much thrust a 747 developed at takeoff speed and he got up and walked away.

Apparently you've never been to China, Shenyang and the Pearl River Delta are certainly more polluted than Thailand.

Be creative.

At the risk of sounding pantomimish.....Oh yes they can!

TIC, TCT, TAT, sound, like the name of a game show. C'mon down and play TIC TCT TAC.