{"id":42304,"date":"2020-07-22T08:00:39","date_gmt":"2020-07-21T23:00:39","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=42304"},"modified":"2026-05-17T11:01:45","modified_gmt":"2026-05-17T02:01:45","slug":"concrete-rain-30-percent-decision","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/concrete-rain-30-percent-decision\/","title":{"rendered":"The chance of rain on the concrete pour date is 30%\u2026 Should we pour or postpone?"},"content":{"rendered":"

Roof Waterproofing Work Where the Weather Determined the Outcome<\/h2>\n

Nowadays, with the widespread use of the Internet, we can check weather forecasts in real time, but when I was young, we had to rely on newspapers and TV, so I think it was harder to predict the weather back then than it is now.<\/p>\n

Since the weather is the one thing that never goes exactly as you want it to, if you make the wrong call, it can naturally lead to a major failure...<\/p>\n

I still vividly remember that rooftop waterproofing project\u2014the weather was the deciding factor.<\/p>\n

\"\u96e8\"<\/p>\n

The heavens turned their backs on us, and a heavy rain fell during the concrete pour.<\/h2>\n

On the day we were scheduled to pour the lightweight concrete for the roof waterproofing reinforcement, the weather forecast showed a 30% chance of precipitation. We debated whether to pour the concrete as planned or postpone it. We were quite torn, but since\u2014as is often the case\u2014this was a project with no set deadline, we decided to go ahead with the pour.<\/p>\n

I\u2019m sure any construction management engineer has encountered a similar situation at least once, but in my case, that decision backfired.<\/p>\n

The morning of the pour was cloudy. I was feeling relieved, thinking everything was going to go smoothly, but just as we had poured about 70 percent of the concrete, the sky suddenly darkened, and then it started pouring.<\/p>\n

\"Has heaven abandoned me!?\" I muttered to myself, recalling that famous line from the movie *Mount Hakkoda*. But there was nothing I could do, so I went ahead and poured concrete on the remaining sections and covered them with protective sheeting. It was infuriating enough that the rain stopped right then, as if on cue.<\/p>\n

The next day, we thoroughly cleaned the concrete surface with a brush and other tools, and on the day after that, we applied a mortar finish using a metal trowel, thereby completing the work.<\/p>\n

However, a week later, I found myself witnessing a scene I had never seen before.<\/p>\n

Concrete Capping Turns into \"Tile Crackers\"<\/h2>\n

When I went up to the roof, I saw that as far as the eye could see, the mortar flooring had buckled up at the joints and was curving upward like a tile cracker about 2 meters in size.<\/p>\n

I\u2019ve seen all kinds of job sites, but this was the first time I\u2019d ever encountered a phenomenon like this. Even the workers on site were stunned. Apparently, simply brushing the rain-soaked concrete surface wasn\u2019t enough to ensure proper adhesion...<\/p>\n

Since there was no deadline, the next day we spent the entire day troweling the floor mortar and chipping it away. We then roughened the surface of the concrete top course\u2014which had been exposed to rain\u2014using a grinder brush and other tools. After thoroughly rinsing it with water, we reapplied the mortar using a metal trowel.<\/p>\n

Fortunately, since the warping and cracking were so severe, we were able to use the concrete-and-mortar expansion joint as is.<\/p>\n

This job site was 30 years ago\u2014a two-story building with a total roof construction area of about 300 square meters. I recall that it cost about 700,000 yen for chipping, roughening the surface, disposing of debris, and reapplying mortar, among other expenses. Fortunately, it was a high-margin project, so we managed to break even...<\/p>\n

Looking back now, I realize that no matter how tight the deadline, I should have sought input from as many experienced professionals as possible and proceeded with the construction a little more cautiously. My decision to try to complete the substrate preparation on the crown\u2014which had been exposed to the rain\u2014with as little effort and expense as possible ultimately led to a situation that ended up costing both time and money.<\/p>\n

In any case, this is one of those moments that really made me realize you just can\u2019t beat the weather.<\/p>\n

 <\/p>\n

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Roof Waterproofing Work Where the Weather Determined the Outcome: Nowadays, with the widespread use of the internet, we can check weather forecasts in real time, but when I was young, we had to rely on newspapers and TV, so I think it was harder to predict the weather back then than it is now. The weather is the one thing that never goes the way you want it to\u2026<\/p>","protected":false},"author":2,"featured_media":39421,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1231],"tags":[1246],"class_list":["post-42304","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-1231","tag-1246"],"acf":[],"yoast_head":"\n\u30b3\u30f3\u30af\u30ea\u30fc\u30c8\u6253\u8a2d\u65e5\u306e\u964d\u6c34\u78ba\u7387\u306f30%\u2026\u6253\u3064\u3079\u304d\u304b\u3001\u5ef6\u671f\u3059\u3079\u304d\u304b\uff1f - \u65b0\u30a8\u30f3\u30bf\u306e\u6cd5\u9762\u7ba1\u7406\u587e<\/title>\n<meta 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